The title "Princess of Poland" was never used. King’s daughter or royal daughter was called królewna. Princesses, in Polish księżniczka, ksiėżna were mainly used in Princely and ducal families of Poland. However, legitimate daughters of the kings and royals of Poland are also referred to and translates as Polish princesses in English language. Simply say Polish royal princess has a separate and distinct name in Polish language which distinguishes her from other princesses and noble ladies of the past.