Judasite
/ˈdʒuːdəsʌɪt/Now rare
noun
A person who emulates or supports the actions of Judas Iscariot, especially in betraying a person or cause; a follower of Judas.
Origin
Late 16th century; earliest use found in Richard Robinson (fl. 1573–1589), poet. From the name of JudasIscariot + -ite.