Boris Altdorfer
- resident of Ynys Fawr
- formerly or alternatively known as Boris of Mordenvale
- 111th in sequence in the Order of Precedence
- Ruled as Prince of Lochac with Princess Constance von Rothenberg from 10 January 1998 to 11 July 1998
- Ruled as Prince of Lochac with Princess Constance von Rothenberg from 8 July 2000 to 13 January 2001
Award of Arms - 27 April 1996
Viscounty - 4 October 1998
Chivalry - 26 April 2000
Valour - 17 August 2000
Defender of the West - 17 August 2000
Knight Bannerette - 6 July 2002