What is Arresto Facto Super Bonis Mercatorum Alienigenorum?

Legal Definition
Arresto facto super bonis mercatorum alienigenorum (literally, "Stoppage made upon the goods of a foreign merchant"), in English law, was a writ against the Personal property of aliens found in the country, as compensation for goods taken from a denizen in a foreign country, after he was denied restitution there.

Among ancient civilians, this was called clarigatio, and later barbarously reprisalia.
-- Wikipedia
Legal Definition
In old English law. A writ against the goods of aliens found within this kingdom, in recompense of goods taken from a denizen in a foreign country, after denial of restitution. Reg. Orig. 129. The ancient civilians called it "clarigatio," but by the moderns it is termed "reprisalia."
-- Black's Law Dictionary
Legal Definition
A writ against the goods of aliens found in England, in recompense of goods taken from a denizen in a foreign country, after denial of restitution.—Black.
-- Ballentine's Law Dictionary