Unidentified Sleeping Headmaster with Castle Sketch

This wizard was appointed Headmaster of Hogwarts before Professor Dippet. After his death, his portrait was hung in the Headmaster's office, in order to give advice to the current head. The large text on his portrait reads "TV NE CEDE MALIS SED CONTRA AVDEN-TIOR ITO" which may translate as "do not give in to evil but proceed ever more boldly against it."