Pope St. Damasus I was the pope in the year 382.
Pope Saint Anastasius I reigned from November 27, 399, until December 19, 401.
Pope Innocent III was pope in the year 1200.
Pope Symmachus
Before 400 AD Christmas was usually celebrated on December 21. Pope Julius 1 decided that Christmas would be celebrated on December 25.
400 AD
Pope St. Sylvester I was pope in the year 325.
The dates historians use for the beginning of the Dark Ages vary a good deal, from about 400 AD, or even earlier, to about 500 AD, or even later. The most commonly used date is 476, and during the time of Pope Simplicius. Possibly the best known pope of the time was Pope Leo I, who was pope from 440 to 461, and convinced Atilla the Hun to leave Italy.
Pope Benedict XV was the pope in 1920.
Pope Saint Linus' papacy lasted nine years from 67 AD to 76 AD.
Anastasius II died in November of that year and was succeeded by Pope St. Symmachus a few days later.
The person that became Pope in AD 236 was Pope Fabian. He succeeded Pope Anterus and served from his inauguration in 236 until he died in the year 250.
Pope St. Julius I
Callixtus II was pope in the year 1123.
400 CE falls within the era known as Late Antiquity or the Early Middle Ages, depending on the region of focus. This period marked the transition from the classical Roman Empire to the medieval kingdoms in Europe, and saw the rise of new cultural and political dynamics.
Pope St. Evaristus was pope in the year 100.