After a battle in this city, Ulf the Quarrelsome traveled to a nearby island, cut his brother’s killer's stomach open, then wrapped him around a tree until all his innards came out. This city, whose name translates as “black pool,” was the site of sea battles between “dark foreigners” and “fair foreigners.” The Njals Saga blames Gormlaith for inciting a battle in this city, which had been ruled by a man who was probably Ragnar Lodbrok’s son Ivar the Boneless. A battle in this city saw the defeat of its ruler (*) Sitric Silkbeard. This city’s Viking rule ended after the Battle of Clontarf, at which Brian (10[1])Boru’s forces defeated those including the King of Leinster. (-5[1])This was the largest city in a country ruled by High Kings. For 10 points, name this city, the largest city in Viking Ireland. ■END■ (10[2]0[1])