If you're talking about the first melodeath albums, you'd have to include Edge of Sanity's Spectral Sorrows (1993) and even before that, Unorthodox (1992). I have always regarded Edge of Sanity as the trendsetter in that whole movement. And they were the first to play that Opeth style epic melodic death as well. Edge of Sanity were always much closer to true melodic death than say At the Gates, who in hindsight now sound basically like a speed/thrash band with death vocals and the odd melodic touch.