Sir Amiel Lannus, also known as just Sir Amiel, is an Imperial ghost. When he was alive, he was the head of the Knights of the Nine, before the order fell apart. His ring unlocks the Priory of the Nine's secret underbelly.
Sir Amiel founded The Knights of the Nine in 3E 111, following his heroic return from the War of the Isle, with the purpose of recovering the Crusader's Relics, the weapons and armor of Pelinal Whitestrake, which had been lost for thousands of years.
In 3E 121 when the War of the Red Diamond began, Sir Amiel was unable to keep his knights out of the war, due to the fame which the Knights were built on. The Knights of the Nine were officially dissolved, by Imperial decree, in 3E 131.
The last reported sighting of any of the Knights of the Nine is that of Sir Amiel. He was reported by a passing traveller to have been living alone in the Priory of the Nine in 3E 150.
In 3E 153 Sir Amiel dies, attempting to recover the Helm of the Crusader in The Shrine of the Crusader, an Ayleid Ruin called Vanua, intended as the shrine of Pelinal Whitestrake. He leaves his journal which tells how to find the pieces of the Relics of the Crusader.
In his journal, Sir Amiel frequently blames himself for the collapse of the order and calling himself 'a foolish old man' regarding the departure of Sir Berich Vlindrel and murder of Sir Caius. At some time in the 3E 430's Sir Amiel guided the Hero of Kvatch (with the help of the ghosts of his fellow knights) to reunify the Relics of Pelinal Whitestrake, original Divine Crusader and predecessor of the Hero. Under the help of Sir Amiel and the other knights, the Hero found all relics and rebuilt the Knights of the Nine.