Who is the author of the book 'Buddha Charitam'?

Ashvaghosha wrote 'Buddha Charitam' (Life of Buddha) in Sanskrit, one of the earliest Buddhist biographies composed around the 1st-2nd century CE. He was a Sanskrit poet and philosopher who converted to Buddhism. Twain wrote American fiction, Marx was a German philosopher, and Kabir was a 15th-century Indian mystic poet.