This is a list of state leaders in the 4th century (301–400) AD.

Africa

Africa: East

• Kingdom of Aksum (complete list) –

• Aphilas, King (f. early 4th century)
• Wazeba, King (f. early 4th century)
• Ousanas, King (c.320)
• Ezana, King (c.333–c.356)
• MHDYS, King (c.350)
• Ouazebas, King (f. late 4th century)
• Eon, King (c.400)

Americas

Americas: Mesoamerica

Mexico

• Teotihuacan –

• Spearthrower Owl, Emperor (374–439)

Maya civilization

• Tikal (complete list) –

• Sihyaj Chan K'awiil I, Ajaw (c.307)
• Unen Bahlam, Ajaw (c.317)
• K'inich Muwaan Jol, Ajaw (?–359)
• Chak Tok Ich'aak I, Ajaw (c.360–378)
• Yax Nuun Ahiin I, Ajaw (c.379–404)

Asia

Asia: Central

Monɡolia

• Rouran Khaganate (complete list) –

• Yujiulü Mugulü, Tribal Chief (4th century)
• Yujiulü Cheluhui, Tribal Chief (4th century)
• Yujiulü Tunugui, Tribal Chief (4th century)
• Yujiulü Bati, Tribal Chief (4th century)
• Yujiulü Disuyuan, Tribal Chief (4th century)
• Yujiulü Pihouba, Tribal Chief (4th century)
• Yujiulü Wenheti], Tribal Chief (4th century)
• Yujiulü Heduohan, Tribal Chief (?-402)

Asia: East

China

• Western Jin, China (complete list) –

• Hui, Emperor (290–307)
• Sima Lun, Emperor (301)
• Huai, Emperor (307–311)
• Min, Emperor (313–316)

• Eastern Jin, China (complete list) –

• Yuan, Emperor (317–323)
• Ming, Emperor (323–325)
• Cheng, Emperor (325–342)
• Kang, Emperor (342–344)
• Mu, Emperor (344–361)
• Ai, Emperor (361–365)
• Fei, Emperor (365–372)
• Jianwen, Emperor (372)
• Xiaowu, Emperor (372–396)
• An, Emperor (396–419)

• Later Liang –

• Lü Guang, Emperor (386–400)
• Lü Shao, Emperor (400)
• Lü Zuan, Emperor (400–401)
• Lü Long, Emperor (401–403)

• Later Qin –

• Yao Chang, Emperor (384–393)
• Yao Xing, Emperor (394–416)

• Later Yan –

• Murong Chui, Emperor (384–396)
• Murong Bao, Emperor (396–398)
• Lan Han, Emperor (398)
• Murong Sheng, Emperor (398–401)

• Northern Liang –

• Duan Ye, Prince (397–401)

• Northern Wei –

• Emperor Daowu, Emperor (386–409)

• Southern Liang –

• Tufa Wugu, Prince (397–399)
• Tufa Lilugu, Prince (399–402)

• Western Liang –

• Li Gao, Prince (400–417)

• Western Qin –

• Qifu Gangui, Prince (388–400)

• Southern Yan –

• Murong De, Prince (398–405)

Japan

• Japan, Yayoi period (complete list) –

• Ōjin, Emperor (270–310)
• Nintoku, Emperor (313–399)
• Richū, Emperor (400–405)

Korea

• Baekje (complete list) –

• Bunseo, King (298–304)
• Biryu, King (304–344)
• Gye, King (344–346)
• Geunchogo, King (346–375)
• Geungusu, King (375–384)
• Chimnyu, King (384–385)
• Jinsa, King (385–392)
• Asin, King (392–405)

• Geumgwan Gaya (complete list) –

• Geojilmi, King (291–346)
• Isipum, King (346–407)

• Goguryeo (complete list) –

• Micheon, King (300–331)
• Gogug-won, King (331–371)
• Sosurim, King (371–384)
• Gogug-yang, King (384–391)
• Gwanggaeto, King (391–413)

• Silla (complete list) –

• Heulhae, King (310–356)
• Naemul, King (356–402)

Asia: Southeast

Cambodia

• Funan (complete list) –

• Zhāntán, King (c.357)

Indonesia

Indonesia: Java

• Salakanagara –

• Dewawarman VII, King (early 4th century)
• Dewawarman VIII, King (early 4th century–362)

• Tarumanagara (complete list) –

• Jayasingawarman, King (358–382)
• Dharmayawarman, King (382–395)
• Purnawarman, King (395–434)

Indonesia: Kalimantan (Borneo)

• Kutai Martadipura –

• Kudungga, King (mid 4th century)
• Asvavarman, King (late 4th century)
• Mulavarman, King (c.400)

Malaysia: Peninsular

• Kedah Sultanate (complete list) –

• Durbar Maharaja I, Maharaja (c.330–390)
• DiMaharaja Putra, Maharaja (c.390–440)^{[citation needed]}

Vietnam

• Champa (complete list) –

• Fan Yi, King (c.284–336)
• Fan Wen, King (336–349)
• Fan Fo, King (349–380)
• Bhadravarman I, King (380–413)

Asia: South

Northeast India

• Kamarupa: Varman dynasty (complete list) –

• Pushyavarman, King (350–374)
• Samudravarman, King (374–398)
• Balavarman, King (398–422)

India

• Western Ganga dynasty (complete list) –

• Konganivarman Madhava, King (350–370)
• Madhava, King (370–390)
• Harivarman, King (390–410)

• Gupta Empire (complete list) –

• Ghatotkacha, King (c.280–319)
• Chandragupta I, Emperor (c.320–335)
• Samudragupta, Emperor (c.335–375)
• Ramagupta, Emperor (c.375–380)
• Chandragupta II, Emperor (c.380–413/15)

• Kadamba dynasty: Banavasi (complete list) –

• Mayurasharma, Maharaja (345–365)
• Kangavarma, Maharaja (365–390)
• Bhageerath, Maharaja (390–415)

• Kushan Empire (complete list) –

• Vasudeva II, Ruler/Emperor (c.275–310)
• Chhu, Ruler/Emperor (c.310?–325?)
• Shaka I, Ruler/Emperor (c.325–345)
• Kipunada, Ruler/Emperor (c.345–375)

• Western Satraps (complete list) –

• Visvasena, Satrap (293–304)
• Rudrasimha II, Satrap (304–348)
• Yasodaman II, Satrap (317–332)
• Rudradaman II, Satrap (332–348)
• Rudrasena III, Satrap (348–380)
• Simhasena, Satrap (380–384/5)
• Rudrasena IV, Satrap (382–388)
• Rudrasimha III, Satrap (388–395)

• Vakataka dynasty (complete list) –

• Pravarasena I, King (270–330)

Pravarapura–Nandivardhana branch

• Rudrasena I, King (330–355)
• Prithivishena I, King (355–380)
• Rudrasena II, King (380–385)
• Prabhavatigupta, Regent (385–405)
• Divakarasena, King (385–400)
• Damodarasena, King (400–440)

Vatsagulma branch

• Sarvasena, King (330–355)
• Vindhyasena, King (355–400)
• Pravarasena II, King (400–415)

Pakistan

• Kushano-Sasanian Kingdom (complete list) –

• Hormizd II, Kushanshah (300–303)
• Peroz II, Kushanshah (303–330)
• Varahran, Kushanshah (330–365)^[1]: 78

Sri Lanka

• Anuradhapura Kingdom (complete list) –

• Mahasena, King (277–304)
• Sirimeghavanna, King (304–332)
• Jettha Tissa II, King (332–341)
• Buddhadasa, King (341–370)
• Upatissa I, King (370–412)

Asia: West

Persia

• Persia: Sasanian Empire (complete list) –

• Narseh, Shahanshah, King of Kings (293–302)
• Hormizd II, Shahanshah, King of Kings (302–309)
• Adur Narseh, Shahanshah, King of Kings (309)
• Shapur II, Shahanshah, King of Kings (309–379)
• Ardashir II, Shahanshah, King of Kings (379–383)
• Shapur III, Shahanshah, King of Kings (383–388)
• Bahram IV, Shahanshah, King of Kings (388–399)
• Yazdegerd I, Shahanshah, King of Kings (399–420)

Europe

Europe: Balkans

• Roman Empire: East/ Byzantine Empire (complete list) –

• Diocletian

• Emperor in civil war (284–285)
• Sole Emperor (285–286)
• Eastern Emperor (286–305)

• Galerius

• Eastern Caesar (293–305)
• Eastern Emperor (305–311)

• Maximinus II

• Eastern Caesar (305–308)
• Eastern Emperor (310–312)

• Licinius

• Western Emperor (308–313)
• Eastern Emperor (313–324)

• Constantine I

• Western Caesar (306–312)
• Western Emperor (312–324)
• Sole Emperor (324–337)

• Constantius II

• Eastern Emperor (337–350)
• Sole Emperor (350–361)

• Julian

• Western Emperor (355–361)
• Sole Emperor (361–363)

• Jovian, Sole Emperor (363–364)
• Valens

• Eastern Emperor (364–378)

• Theodosius I

• Eastern Emperor (379–392)
• Emperor (392–395)

• Arcadius

• Junior Emperor (383–395)
• Eastern Emperor (395–408)

Europe: British Isles

Ireland

• Ireland (complete list) –

These kings are generally thought historical, but dates are uncertain and naming some High Kings may be anachronistic or inaccurate.

• Niall Noígíallach, High King (generally thought historical: 4th–5th century)
• Nath Í, High King (4th–5th century)

Europe: Central

• Alamannia, tribal kingdoms (complete list) –

• Chrocus, leader (fl.260–306)
• Mederic, petty king (early 4th century)
• Chnodomarius, petty king (pre-350–357)
• Gundomadus, petty king (fl.354–357)
• Agenaric, petty king (fl.357)
• Suomarius, petty king (fl.357–358)
• Hortarius, petty king (fl.357–359)
• Vestralpus, petty king (fl.359)
• Urius, petty king (fl.359)
• Ursicinus, petty king (fl.359)
• Macrianius, petty king (fl.359)
• Hariobaudes, petty king (fl.359)
• Vadomarius, petty king (fl.359)
• Rando, petty king (fl.368)
• Vithicabius, petty king (360–368)
• Priarius, petty king (?–378)

• Vandals (complete list) –

• Wisimar, King (?–335)
• Godigisel, King (359–407)

Europe: East

• Bosporan Kingdom (complete list) –

• Theothorses, client king under Rome (279–309)^[2]
• Rhadamsades, client king under Rome (309–322)^[2]
• Rhescuporis VI, client king under Rome (314–341)^[2]

Europe: Southcentral

• Roman Empire: West (complete list) –

• Maximian

• Caesar (285–286)
• Western Emperor (286–305)

• Constantius Chlorus

• Western Caesar (293–305)
• Western Emperor (305–306)

• Severus

• Western Caesar (305–306)
• Western Emperor, in civil war (306–307)

• Maxentius, Western Emperor, in civil war (306–312)
• Licinius

• Western Emperor (308–313)
• Eastern Emperor (313–324)

• Constantine I

• Western Caesar (306–312)
• Western Emperor (312–324)
• Sole Emperor (324–337)

• Crispus, Caesar (317–326)
• Constantine II, Emperor of Gaul, Britannia, and Hispania (337–340)
• Constans I

• Emperor of Italy and Africa (337–340)
• Western Emperor (340–350)

• Constantius II

• Eastern Emperor (337–350)
• Emperor (350–361)

• Magnentius, usurper Emperor (350–353)
• Decentius, usurper Caesar (350–353)
• Vetranio, Co-Emperor (350)
• Julian

• Western Emperor (355–361)
• Sole Emperor (361–363)

• Jovian, Sole Emperor (363–364)
• Valentinian I, Western Emperor (364–375)
• Gratian

• junior Western Emperor (367–375)
• Western Emperor (375–383)

• Valentinian II

• junior Western Emperor (375–383)
• Western Emperor (383–392)

• Magnus Maximus, usurper Emperor (383–388)
• Eugenius, Western Emperor (392–394)
• Theodosius I

• Eastern Emperor (379–392)
• Sole Emperor (392–395)

• Honorius, Western Emperor (395–423)
• Stilicho, power behind the throne (395–408)

Eurasia: Caucasus

• Armenia: Arsacid dynasty (complete list) –

• Tiridates III, client King under Rome (287–330)
• Khosrov III, client King under Rome (330–339)
• Tiran VII, client King under Rome (339–c.350)
• Arsaces II (Arshak II), client King under Rome (c.350–368)
• Interregnum under Sasania
• Pap, client King under Rome (370–374)
• Varazdat, client King under Rome (374–378)
• Arsaces III (Arshak III), client King under Rome (378–387)
• Vologases III, client King under Rome, Co-Ruler (378–386)
• Khosrov IV, client King under Rome (387–389)
• Vramshapuh, client King under Rome (389–417)

• Kingdom of Iberia (Kartli) (complete list) –

• Mirian III, King (284–361)
• Sauromaces II, King (361–363)
• Aspacures II, King (363–365)
• Mihrdat III, King (365–380)
• Aspacures III, King (380–394)
• Trdat, King (394–406)