Simon takes the citadel in Jerusalem (1 Macc 13:49-13:53)

“The men who were in the citadel at Jerusalem were prevented from going in and out to the country to buy and sell things. So they were very hungry. Many of them perished from famine. Then they cried to Simon to make peace with them. So he did. He expelled them from there. He cleansed the citadel from its pollutions. On the twenty-third day of the second month, in the one hundred seventy-first year, the Jews entered it with praise and palm branches. They had harps, cymbals, and stringed instruments. They sang hymns and songs because a great enemy had been crushed and removed from Israel. Simon decreed that every year they should celebrate this day with rejoicing. He strengthened the fortifications of the temple hill alongside the citadel. He and his men lived there. Simon saw that his son John had reached manhood, so he made him commander of all the forces. He lived at Gazara.”

The Syrian men who were in the Jerusalem citadel could not go in or out to buy or sell anything. Thus they became hungry like a famine. Finally, they wanted to make peace with Simon. He decided to expel them from the citadel. There was a big celebration with praise and palm branches as the Jews entered the citadel in 141 BCE, about a year after their independence. Before they went in with harps, cymbals, and stringed instruments singing hymns and songs, they had the citadel cleansed from the foreign pollutions. They were going to celebrate this every year on the 23rd day of the 2nd month, that is sometime in May. Simon and his men decided to live in the citadel. He sent his son John to be the commander of the armed forces and live in Gaza. This apparently was his son John Hyrcanus who was the high priest from 134-104 BCE.