Guy was the eldest son of Henry I Embriaco and Isabella of the House of Ibelin, a daughter of Lord Balian of Beirut.
[1] According to the Lignages d'Outremer, Guy married Margaret, daughter of Count Julian of Sidon.
[3] On 1 October 1274, Guy named his daughter Mary as his heir if he died without sons and made his uncle Bertrand her guardian.
[4] Between 1276 and 1282, Guy was embroiled in a war with the Countess Sibyl and Bishop Bartholomew of Tortosa, regents of the County of Tripoli for the young Bohemond VII.
He was forced to repel a major Tripolitanian attack on Gibelet, resulting in high casualties and a year-long truce.
[2] His friends were blinded, but Bohemond had Guy, his brothers John and Baldwin and his cousin William taken to Nephin and buried up to their necks in sand in the moat.