Perturabo

He is the Primarch of the Iron Warriors. Characterised by his enmity with Rogal Dorn and a skill for leading sieges.
 * In baseline Lovehammer, Perturabo is married to Mercury and is a loyalist.
 * In Scattering of Serenity, Perturabo falls after the Horus Heresy.
 * In Heresy and Rebirth, Perturabo (Heresy & Rebirth) is alive and apparently running the Imperium of Mankind.