Helveticus, known as "Ancient Helveticus," was a Standard Bearer of the Ultramarines Chapter's sacred Banner of Macragge in recent times, taking part in the Battle of Macragge, where the Ultramarines confronted the menace of the Tyranids of Hive Fleet Behemoth in 745.M41. Helveticus was present aboard Chapter Master Marneus Calgar's Battle Barge when it was boarded by Tyranids. He led the fierce counter-attack against the encroaching xenos, and was subsequently killed in battle, both fatally poisoned and burned. His grip upon the shaft of the banner was said to be so tight that initially it could not be pried from his hands even after his death. Ancient Helveticus was succeeded by Ancient Galatan.
- Chapter Approved: Second Book of the Astronomican (2001), "Ultramarines Special Characters - Ancient Helveticus, Bearer of the Battle Standard of Macragge," by Andy Chambers, pp. 120-121
- Codex: Ultramarines (2nd Edition), pg. 73
- White Dwarf 256 (UK), ""Ultramarines Special Characters - Ancient Helveticus, Bearer of the Battle Standard of Macragge," by Andy Chambers, pp. 88-89