Of Simon Iscariot (Simōnos Iskariōtou). So his father was named Iscariot also, a man of Kerioth (possibly in Judah, Jos 15:25, possibly in Moab, Jer 48:24), not in Galilee. Judas was the only one of the twelve not a Galilean. The rest of the verse is like Joh 12:4.
One of the twelve (heis ek tōn dōdeka). The eternal horror of the thing.