from Old French bobance (also boban, -ant) arrogance, pomp:
cf. Provencal bobansa of same meaning
From: The Boy's King Arthur,
Being Sir Thomas Malory's History of King Arthur and His Knights of the Round Table.
Edited by Sidney Lanier. 1880
Book IV, Chapter XLVIII, Of Sir Tristram
Of the Preparation of Sir Palamides and the Two Brethren
that should fight with him.