December 25, 274
Emperor Aurelian makes Sol Invictus to an official cult, it becomes the state religion of Rome.
Repousse silver disc of Sol Invictus
Sol Invictus ("Invincible Sun") was the official sun god of the later Roman empire. In 274 Aurelian made it an official cult alongside the traditional Roman cults. Scholars disagree whether the new deity was a refoundation of the ancient Latin cult of Sol, a revival of the cult of Elagabalus or completely new. The god was favored by emperors after Aurelian and appeared on their coins until Constantine. The last inscription referring to Sol Invictus dates to 387 AD. and there were enough devotees in the 5th century that Augustine found it necessary to preach against them. A festival on 25 December is thought to be responsible for the date of Christmas.
April 21, 753 BC
Romulus and Remus founded Rome.
Capitoline Wolf suckles the infant twins Romulus and Remus.
Rome's early history is shrouded in legend. According to Roman tradition, the city was founded by Romulus on 21 April 753 BC.The legendary origin of the city tells that Romulus and Remus decided to build a city. After an argument, Romulus killed his brother Remus. The Roman poet Virgil refers to this belief when he depicts Aeneas as escaping the fall of Troy by coming to Latium to found a line descending to Romulus, first king of Rome. Archaeological evidence supports the view that Rome grew from pastoral settlements on the Palatine Hill built in the area of the future Roman Forum.