German (2007:174)

 Hè is a reduced form of hent [henn], also pronounced hint [hint] in much of 
 Central Cornouaille and Tregor (literary Breton int; Middle Welsh int; (h)wynt.
 Hè/hent is a free morpheme which can be placed either before or after a (normally) 
 uninflected 3rd person singular verb (+ AUX). This slide towards analycity must
 have been facilitated by a need to identify the subject, wether masculine or feminine, 
 in the phrase, a phenomenon which was probably reinforced by analogy with the structures 
 just signaled in 2.8.3. In the following affirmative sentences, the subject pronoun directly 
 follows the verb boud, the main lexical verb or the verbal group.