Count Philippos Atreides was a noble who lived around Henoor III's death (1604 AG). Since Henoor had no heirs, civil war seemed certain, until Philippos persuaded a special session of the Landsraad that they should control a Regency while they sorted out the various contentions of the heirs and to settle the opposing claims. Abulurd VI Harkonnen carried his objections from the assembly to his awaiting fleet, and planned to attack the Landsraad meeting site. Then the Atreides challenged him to kanly. Abulurd accepted the challenge, with the Imperium at stake, and was defeated.