Solomon "Solo" Bolden (unknown - 1805), better known as the "Black Cross", was a Templar agent active during the early 19th century.
The inquisitor of the Inner Sanctum like all the Black Crosses before him, Bolden travelled all around the world to keep an eye on the Grand Masters of the various Rites, to verify that they stayed in line with the Templar Code and if necessary to eradicate any corrupted Templars he could find.
In 1805, Bolden posed as a slaver sailing to Tripoli in order to buy slaves, while in fact he was planning to rescue his predecessor, Tavis Olier, who was believed to be dead while he was in fact kept prisonner in the city dungeon. During the crossing of the Mediterranean Sea, Bolden dispatched pirates sent after him by the Sultan Selim III and "befriended" Jan van der Graff, a Dutch agent of Napoleon Bonaparte supposedly sent to Tripoli to acquire precious fabrics. The two men made a pact, Bolden would protect Graff during his mission and the Dutch would use his contacts to help the Black Cross enter into the palace.
Once in the port city of Derna, the two men took camels and traveled to Tripoli, where they eventually met with the Dutch's contacts in a local tavern. There, Edmund, a deserter marines and Ahkbar, a shady local, revealed to them the existence of a secret underground tunnel used by the Sultans to discretly smuggle precious cargo into the palace. Following the departure of their companions, Bolden and Graff bonded over several drinks with the Black Cross trying to learn what was "the diamond" mentionned by Edmund, until being interrupted by the latter being shot by guards in the street.
Later, they entered the tunnel after Graff picked the lock of the gate but were confronted by several men waiting for them, and during the brawl Ahkbar, who was in fact an agent of the Sultan, stabbed Bolden in the back. With his last breath, Bolden told Graff to find Tavis, to find the Black Cross.