The first game ever to be created was https://www.warlight.net/MultiPlayer?GameID=1000000
. It was created on 14/07/2008 (UK date format).
According to the change history (see TBest's link below), WarLight was created on 18/06/2008 (UK date format)
BTW, there'sa difference of 4 days and 1 month because there weren't always GameIDs.
Edited 1/6/2016 16:36:16