The Ariete was an Italian Main Battle Tank designed used for a long time but now adapted to German service in the Reichswehr.
See Wikipedia for more detailed information.
Because of need of lighter support vehicles, it was taken and readapted for a slightly different purpose than the original model. Non Explosive Reactive Armor Blocks were added to improve the defense, as well as new computer systems, and an engine to get it to go at 75kmph in favorable terrain. Ontop a MG45 machinegun was added as well as a small rocket launcher, to work against Infantry.