Marco

Marco was the commander of Rocco de' Medici's guards but had been on Piero de' Medici's payroll for the months leading up to the war against Milan and was later left to guard the Superweapon.

Biography
When Rocco discovered that Piero was responsible for the death of his father, the old Duke of Florence, he called for Marco and the guards to Verrocchio's Workshop to arrest Piero and throw him in jail. However, Piero smugly revealed that he had been paying Rocco's men for months and had them arrest Rocco, Leonardo da Vinci and Machiavelli. Marco found tools hidden at the back of the workshop, and Piero realised Leo had sabotaged the Superweapon and threatened to kill Mac, forcing him to fix it. Piero told Marco that he would kill Rocco and blame it on Leo and Mac.

Marco and his men were left to guard the superweapon and refused to let Tomaso Gheradini in. She returns, dressed as a cleaning maid, and, this time, Marco lets her in but is shocked when she climbs inside the tank and aims at him. Marco and his men flee, declaring they don't get paid enough for this. (The Dogs of War)

Personality
Marco was greedy and had no honour or loyalty, as he betrayed his Duke for money. He was also quite observant to find the tools but underestimated Lisa Gherardini as he thought she was just a serving maid. He subsequently left her to it as he didn't feel obliged due to not being paid enough.