He can be found on the 2nd3rd floor[UK] of the tower on the west side of the White Knights' Castle in Falador and in the Banquet room in Lumbridge castle during Recipe For Disaster quest.
This article on an NPC has an associated dialogue page. Click here for a transcript of possible conversations with this NPC.
Sir Amik Varze on a stamp from postbags.
When asked about the "Siege of Falador", Sir Amik Varze will reply with a brief response about Kara-Meir, as well as Squire Theodore, both of which are 2 major protagonists of the Runescape novels "Betrayal at Falador", "Return to Canifis", and "Legacy of Blood". However, when asked about Theodore, he replies sadly that "...He is no longer with us."
As with many of the White Knights and Temple Knights, his name is a play on words; when spoken with a non-rhotic accent, it sounds like "ceramic vase".