Short answers, pulled from the story.
Decimus Clodius Albinus arrived in Hadrumetum around 150 CE which modern historians identify as Sousse Tunisia. He emerged from an aristocratic Roman family that commanded respect across this region of Africa Province.
Albinus found himself proclaimed emperor by armies stationed in Britain and Gaul simultaneously after Pertinax assassination created chaos in 193. Three distinct claimants vied for control of Rome while he secured Illyricum and Pannonia through military force rather than tradition.
The Senate declared Albinus official enemy of Rome following news in autumn 196 that Severus appointed Caracalla as successor with Caesar title. This revelation prompted Albinus to mobilize forces across Britannia and cross into Gaul without anything left to lose.
Decimus Clodius Albinus confronted Severus army at Lugdunum near modern Lyon France where Cassius Dio recorded troop numbers reaching 150,000 on each side. He suffered defeat and his headless corpse joined family members thrown into Rhône river waters nearby after execution ordered by Severus.
The Historia Augusta text claims his parents were Aurelia Messallina and Ceionius Postumus but no other source confirms these names today. Scholars dismiss this genealogy as unreliable fiction rather than fact while another claim suggests he earned the name Albinus due to unusually pale skin tone.