 Brontinus is presented as either the husband or father of Theano (see section 3.3 below). Brontinus (DK I 106–107) is elsewhere said to have had a wife Deino and to be either from Metapontum or Croton. Little is known about him, but his existence appears to be confirmed by Alcmaeon, writing in the late sixth or early fifth century, who addresses his book to a Brontinus along with Leon and Bathyllus (Fr. 1 DK). The latter two may also be Pythagoreans, since a Leon is listed under Metapontum and a Bathylaus (sic) under Posidonia, in Iamblichus’ catalogue.