Nard is a board game that is considered to be the direct ancestor of backgammon, originating in Persia or India
Senet is a board game that is one of the oldest known games, originating in ancient Egypt and possibly having some influence on the development of backgammon
Tabula is a board game that is the Roman version of the Greek game of petteia, which is another possible ancestor of backgammon
Royal Game of Ur is a board game that is one of the oldest known games, originating in ancient Mesopotamia and having a similar board and pieces to backgammon
Sugoroku is a board game that is the Japanese version of backgammon, having a similar board and rules but different dice and pieces