Analysis of information sources in references of the Wikipedia article "Mentor (brig)" in English language version.
Favorable winds brought the ship to Cape Matapan, the southernmost point of mainland Greece. Then a strong easterly wind developed, forcing it to spend the night there. Already in Piraeus, as they were loading the cargo, the captain, William Eglen, had became [sic] embroiled in a heated argument with Lord Elgin's secretary because he thought the crates were too heavy for the Mentor. Eglen turned out to be right. Hoping to save the ship, he made for anchorage on the nearby island of Kythera. He almost made it. In the afternoon of the same day Mentor reached the small port of Avlemonas on Kythera but the weather was too bad for the ship to dock. The sailors tried moor the ship with two anchors off the port, but the anchors failed to hold the ship in the heaving sea. It swung onto the rocks, crashed and quickly sank to a depth of 23 meters. All the passengers and crew were rescued by the vessel Anikitos.