Ancient | 4th century | 5th century | 6th century | 7th century | 8th century | 9th century 10th century | 11th century | 12th century | 13th century | 14th century | 15th century 16th century | 17th century | 18th century | 19th century | 20th century | 21st century
This category contains scientists active during the 4th-century. Scientists can also be browsed by nationality.