Were William the Conqueror and Al-Ghazali alive at the same time?
Yes. William the Conqueror and Al-Ghazali were alive at the same time, from 1053–1059 to 1087.
William the Conqueror
King of England from 1066 to 1087, Duke of Normandy from 1035 to 1087
Born 1027–1028 · died 9 September 1087