Seiken Densetsu - First released in the US as Final Fantasy Adventure (GB), later as Sword of Mana(GBA)
Seiken Densetsu 2 - Secret of Mana (SNES)
Seiken Densetsu 3 - Never released in the US, but there is a translated SNES rom
Seiken Densetsu 4(I seem to remember reading that this actually was not its japanese title) - Legend of Mana (PS)