Little is known of Bosch’s life or training. He left behind no letters or diaries, and what has been identified has been taken from brief references to him in the municipal records of 's-Hertogenbosch, and in the account books of the local order of the Brotherhood of Our Lady. Nothing is known of his personality or his thoughts on the meaning of his art. Bosch’s date of birth has not been determined with certainty. It is estimated at c. 1450 on the basis of a hand drawn portrait (which may be a self-portrait) made shortly before his death in 1516. The drawing shows the artist at an advanced age, probably in his late sixties.