Century is a time period of 100 years (stemming from the Latin cent meaning 100).Centuary is of or pertaining to Centaurs the mythical creatures (half man, half horse).
They lived in the 14th, 15th and 16th century. i don't know if it was AD or BC, sorry... ......I'm pretty sure it was AD....... I'm 60% sure it was AD and 40% sure it was BC... flip a coin or...