Phrastor brought suit against them for refusing to register his son, but the members of the gens challenged him before the arbitrator to swear by full-grown victims that he verily believed the boy to be his own son, born of an Athenian woman and one betrothed to him in accordance with the law. When the members of the gens tendered this challenge to Phrastor before the arbitrator, he refused to take the oath, and did not swear.