What is Actio Vi Bonorum Raptorum?

Legal Definition
An action for goods taken by force; a species of mixed action, which lay for a party whose goods or movables (bona) had been taken from him by force, (vt,) to recover the things so taken, together with a penalty of triple the value. Inst. 4, 2; Id. 4, 6. 19. Bracton describas it as lying de rebus mobilibus vi ablatis sive robbatis, (for movable things taken away by force, or robbed.) Bract, fol. 103b.
-- Black's Law Dictionary