Laomedeia (/ˌleɪoʊmᵻˈdiːə, -ˈdaɪə/ LAY-o-mə-DEE-ə or LAY-o-mə-DY-ə; Greek: Λαομήδεια), also known as Neptune XII, is a prograde irregular satellite of Neptune. It was discovered by Matthew J. Holman, et al. on August 13, 2002. Before the announcement of its name on February 3, 2007 (IAUC 8802), it was known as S/2002 N 3.