Ibn Khallikan
Ibn al-Qaisarani was born in Jerusalem in about 1057 to an Arab family originally from Caesarea, hence his name. Because of the Arabic name for Jerusalem being "Bait al-Maqdis," he was often nicknamed "Maqdisi" or the man from Jerusalem instead. His birth date is recorded by Ibn Khallikan as 6 Shawwal in 448 on the Islamic calendar, which William McGuckin de Slane reckoned as December 1056 on the Gregorian calendar.