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IAPYS, nomen auguris, ac citharoedi, lege Iapis. Virg. Aen. l. 12. v. 391. & seqq.

Lexicon Universale
Navigatio

Anterius
Iapygium

Posterius
Iapyx

In Vicipaedia:

In Victionario:

Iamque aderat Phoebo ante alios dilectus Iapis,
Iasides acri quondam cui captus amore
Ipse suas artes, sua munera laetus Apollo,
Augurium citharamque dabat, celeresque sagittas.

Idem ibid. v. 125. & 420.