Pigres in Harpers Dictionary of Classical Antiquities (1898)
（Πίγρης). A Greek poet of Halicarnassus, regarded by Baumeister and others as author of the Batrachomyomachia (q. v.). He is said to have been either the brother or son of Queen Artemisia (q.v.) of Caria. Besides the work mentioned, a poem called Margites is ascribed to him by Suidas (s. v.) and by Plutarch. He also inserted a pentameter line after each hexameter in the Iliad -a very curious literary freak. The following will serve as an illustration ( Il. i. 1):
Μῆνιν ἄειδε θεὰ Πηληιάδεω Ἀχιλλῆος,
Μοῦσα γὰρ σὺ πάσης πείρατ̓ ἔχεις σοφίης:
He is also said to have been the first poet to introduce the iambic trimeter. See Homerus.
Pigres of Halicarnassus in wikipedia
Pigres, a native of Halicarnassus, either the brother or the son of the celebrated Artemisia, satrap of Caria. He is spoken of by the Suda (s.v. where, however, its author makes the mistake of conflating Artemisia, the wife of Mausolus, with Artemisia, the advisor of Xerxes in the Histories of Herodotus) as the author of the Margites, and the Batrachomyomachia. The latter poem is also attributed to him by Plutarch (de Herod. malign. 43. p. 873f), and was probably his work. One of his performances was a very singular one, namely, inserting a pentameter line after each hexameter in the Iliad, thus: -
Μῆνιν ἄειδε θεὰ Πηληϊάδεω Ἀχιλῆος
Μοῦσα· σὺ γὰρ πάσης πείρατ᾽ ἔχεις σοφίης.
Bode (Gesch. der Hellen. Dichtkunst. i. p. 279) believes that the Margites, though not composed by Pigres, suffered some alterations at his hands, and in that altered shape passed down to posterity. Some suppose that the iambic lines, which alternated with the hexameters in the Margites, were inserted by Pigres. He was the first poet, apparently, who introduced the iambic trimeter. (Fabric. Bibl. Graec. i. p. 519, &c.)