A hoard of 30 golden coins helped archaeologists to date a recently-uncovered shipwreck in the Bay of Haifa, near the ancient city of Acre. The wood of the ship dated to the years between 1062 and 1250 AD, but there was no way to tell when the ship actually sank until the coins were identified. These coins were golden florins, produced in Florence, Italy, starting in 1252. The ship, then, could not have sunk earlier than 1252.
In fact, most archaeologists believe the ship sank nearly 40 years later, when the Christian European occupiers fled the city when Egyptian sultan Al-Ashraf Khalil invaded with 100,000 men. International trade through the city abruptly ceased as the European forces struggled to escape the city. A group of Templar Knights found to hold their ground against the invasion, while merchants and civilians escaped. The recently found shipwreck appears to be one of the vessels that fled Acre in 1291.
The gold florins are the main link to the Crusaders; witnesses of the Siege of Acre reported that the wealthy attempted to buy and bribe their way to safety with gold and other valuables. Of course, it is not known who was actually aboard the ship when it went down; whoever it was, they succeeded in escaping Acre only to perish at sea, going down with their gold.