- Born: 07/08/1990 in Pinneberg, Schleswig-Holstein, West Germany
- Birthname: Marcel Barthel
- Height & Weight: 6'3", 220 Ib
- NXT Tag Team Championship (2 times) – with Fabian Aichner
- wXw Unified World Wrestling Championship
- wXw World Tag Team Championship (2 times) – with Da Mack
- Mitteldeutschland Cup (2014)
- Four Nations Cup (2015)
He performs in WWE under the ring name Ludwig Kaiser, and is a former NXT Tag Team Champion with Fabian Aichner. He spent several years in Walter’s (Gunther) stable Imperium, before they were promoted to the main roster together and received name changes. Before coming to WWE, Barthel wrestled primarily in his native Germany under the ring name Axel Dieter Jr, most notably for Westside Xtreme Wrestling (wXw).
He also wrestled in the United Kingdom for Progress Wrestling. In wXw, Dieter was a two-time World Tag Team Champion and a one-time Unified World Wrestling Champion.
Other Notable Achievements: EWP Tag Team Championship – with Da Mack, Great Bear Grand Championship, GSW Tag Team Championship – with Da Mack, NFC First Fighter Championship, International NCW Cruiserweight Championship, First Fighter Tournament (2010), PWF North-European Championship