Pĕlăgĭus

ii, m.
I. a famous heretic of the fifth century A. D., Aug. Ep. 175; id. Haeres. 88.—Hence, Pĕlăgĭānus, i, m., a follower of Pelagius, Isid. Orig. 8, 5, 63.
Lewis & Short
A Latin Dictionary, 1879
An open-access project