Someone else asked the Dalai Lama the first question that was on my mind,

“What if the Buddha never really existed?”

“So What! That does not change the nature of reality and the value of understanding the Four Noble Truths.” replied H.H. The Dalai Lama
The first teachings of the Buddha, The Four Noble Truths explained by H. H. the Dalai Lama (video after the jump).

YouTube – Dalai Lama – The Four Noble Truths Part 1/4 is an audio teaching of this written teaching.