According to Michael the Syrian, news of these machinations enraged John II, who in 1132 embarked on a campaign against both the Turks and the Armenians, capturing two fortresses on the shores of the Black Sea. However, his campaign was cut short when Isaac's sympathizers in Constantinople tried to use the emperor's absence to stage a coup. Informed of the conspiracy, John returned to the capital and thwarted their plans, but the Turks were able to counterattack and raid successfully into Byzantine territory, threatening the fortresses of Zinin and Sozopolis. Following 1132, Isaac is no longer mentioned by Michael the Syrian. During this time, he visited the Holy Land in pilgrimage, financing the construction of a new aqueduct for the Monastery of Saint John the Baptist near the Jordan River. It is likely, although no source mentions this, that the journey also had the purpose of seeking the aid of the King of Jerusalem, Fulk ().