sentences:  Saint Helena provided funds from the imperial treasury for the maintenance of the chapel.The funding continued for three centuries of Byzantine rule in Phoenicia until Khalid ibn al-Walid defeated Emperor Heraclius at the Battle of the Yarmuk.While the caliphate, Omar, who became ruler of Jerusalem, was a pious and humble man, sparing Christendom's holiest shrines and being tolerant of his Christian subjects, the Arab rulers of the rest of Byzantium were less tolerant of the Christians, especially in the maritime cities of Tyre, Sidon, Beirut, Byblos, and Tripoli.