Sons of the Phoenix

The Sons of the Pheonix is a Loyalist Space Marine Chapter comprised entirely of Primaris Space Marines created from the lineage of the Imperial Fists and raised during the Ultima Founding of 999.M41.Faithful to the Emperor and ritualistic in their battle cant, the Sons of the Phoenix pride themselves on plunging into the flames of battle. Their crusades are so impressive in spectacle they pave the way for the Imperial Creed to spread, and hence are followed by a great many holy mean and women

Source

 * White Dwarf (Oct 2017), "Eavy Metal" - "Create your own Chapter", pg 117