Question: 1 ad how many years?
Answer: B.C. and A.D. Explained A.D. comes from the Latin "anno Domini," which means "in the year of the Lord." A.D. applies to years following the birth of Jesus. Therefore, it's easy to assume that A.D. 1500 means 1,500 years after Jesus was born, but that's not strictly true because A.D. began at 1.