Villar Constance

Villar is the Earl of Artuk and Marrine's cousin despite being from the Factory Union. He is an earl who rules over Artuk on the eastern side of the continent. Rumor has it that he'll only agree to contracts with attractive female students at the magic university; not only that, but once they turn 25, he voids their contracts and pairs up with a new female student. This is why he's known as the Lustful Earl. He was the Lord that Siluca was en route to until she met Theo.

(Source: Grancrest Senki Wiki)