Algernon Setonis was a large moustached farmer who lived on planet Tarentus inside the Ultramar segmentum. He was a hulking man known for his enduring strength and compassion for others. His strength was so renown that it eventually drew the attention of the Ultra Astartes. Although Algernon's body had matured past the recommended age for a space marine neophite he cleared all tissue compatability tests as well as psychological screening. So Algernon left his loving family and friends behind to undergo the excruciating process to become a Space Marine. Survival chances were very slim but the honor to be accepted into Chapter Astartes was too great, he could not say no, even if he wished to.
The gene seed implantation process was especially hard on Algernon's body, each surgery had complications due to Algernon's fully matured body, he would bairly survive each time.