The term Three Founding Families (始まりの御三家, Hajimari no Gosanke?) refers to the three families who created a Holy Grail War system. There are two different sets of families for two different Holy Grail Wars.
Fuyuki Holy Grail WarEdit
The creators of the Fuyuki Holy Grail War are:
Ainsworth Holy Grail WarEdit
The creators of the Ainsworth Holy Grail War are: