Syria retained its Byzantine-era bureaucracy, which was staffed by Christians including the head of the tax administration, Sarjun ibn Mansur.^[115] The latter had served Mu'awiya in the same capacity before his attainment of the caliphate,^[116] and Sarjun's father was the likely holder of the office under Emperor Heraclius (r. 610–641).^[115] Mu'awiya was tolerant toward Syria's native Christian majority.^[117] In turn, the community was generally satisfied with his rule, under which their conditions were at least as favorable as under the Byzantines.^[117] Mu'awiya attempted to mint his own coins, but the new currency was rejected by the Syrians as it omitted the symbol of the cross.^[118] The sole epigraphic attestation to Mu'awiya's rule in Syria, a Greek inscription dated to 663 discovered at the hot springs of Hamat Gader near Lake Tiberias,^[119] refers to the caliph as ʿAbd Allāh Muʿāwiya, amīr al-muʾminīn ("God's Servant Mu'awiya, commander of the faithful"; the caliph's name is preceded by a cross) and credits him for restoring Roman-era bath facilities for the benefit of the sick.^[120] According to the historian Yizhar Hirschfeld, "by this deed, the new caliph sought to please" his Christian subjects.^[120] The caliph often spent his winters at his Sinnabra palace near the shores of Lake Tiberias.^[121] Mu'awiya was also credited with ordering the restoration of Edessa's church after it was ruined in an earthquake in 679.^[122] He demonstrated a keen interest in Jerusalem.^[123] Although archaeological evidence is lacking, there are indications in medieval literary sources that a rudimentary mosque on the Temple Mount existed as early as Mu'awiya's time or was built by him.^[124][e]