Full Name: Violeta Trask
Violeta Trask was one of the first known practioners of Arithmancy having learnt it from Rowena Ravenclaw herself. After graduating in 956, she travelled the world until 975, aged 37. Whereupon she returned to Hogwarts to teach her studies of Arithmancy. One of her students was Merlin, whom she could not get to learn Arithmancy properly. She counted this as her only failure. She became Head of Ravenclaw House in 1005. It is unknown when she died but she retired from teaching in 1028, aged 90.