Henri Marchal was a French architect and civil servant. He devoted a great part of his life to research on the art and archeology of Cambodia and the conservation and restoration of Khmer monuments at the archeological site of Angkor, in Cambodia.

Preah Pithu is a group of five temples at Angkor, Cambodia. In fact they were in all probability not designed as a group. Despite their ruined state, the remains have good decorative carving and their semi-wooded setting is attractive and peaceful.