Amsterdam 1666 has a strange history, originally starting as a Patrice Desilets game under the THQ Montreal label before getting snapped up by Ubisoft when THQ went defunct. Desilets had to fight for ownership of his creation, eventually winning the IP rights for the game in 2016.
Source: N4G PC Assassins Creed creator Patrice Desilets will make Amsterdam 1666, but hell start from scratch