Celtic, perhaps pagan or Wiccan altar, judging from all of the Celtic knot-work, including the central circle on the altar cloth, made of a triskele, which usually stands for the triple goddess. The creator also states that this altar evokes the month of March, and lists all of the gemstones.
Pertinax, the 19th Roman emperor. He was the first of the emperors in the year of the five emperors. He was assassinated 3 months after taking office by the Praetorian Guard after trying to reestablish discipline within their ranks.