The original version was written at the University of Oklahoma by Robert Alan Koeneke and Jimmey Wayne Todd, after they became hooked on Rogue but could not run it on the VAX-11/780 minicomputer to which they had access.
Version 1.0 was written in VMS Pascal and completed in the summer of 1983. From around 1985 the source code was widely distributed under a license that permitted sharing and modification but not commercial use. Koeneke's last release was Moria 4.7 in 1986 or 1987, although more recent versions have been compiled by a variety of authors.
As in most roguelikes, it is impossible to re-load from a save if your character dies, as the game saves the state only upon exit, preventing save-scumming that is a key strategy in most computer games that allow saving.