In the SCA Marcus is known as Lord Marcus Galmsson.
As my son, he's technically been in the SCA since he was born in 1998. In the last few years he's started fighting and taking it seriously.
Here is his listing from the Atlantian Order of Precedence (as of Feb 2020):
Lord Marcus Galmsson
Marcus's Arms: none registered yet
- Award of Excellence of Lochmere (Lochmere - 8/7/2007)
- Augmentation of Arms (Royal Augmentation: an escallop purpure - 6/21/2008)
- Order of the Hippocampus (Atlantian Youth Award - 1/19/2013)
- Award of the Alerion (Lochmere Youth Award - 8/2/2015)
- Companion of the Silver Osprey (Atlantia Unbelted Excellence in Armored Combat - 2/16/2019)