Answer:
His name was Cosimo I de Medici.
It allowed the Union to repel the Confederate invasion of the North.
The British were unsuccessful in the South due to constant harassment from partisan fighters. Although a number of loyalists emerged, there were reluctant to openly support the British. The British soldiers were also not enough to maintain control of both South Carolina and North Carolina.
It was located on the east side of 5th Street NW, between K and L, Presidents day Mount Vernon Triangle neighborhood of Washington D.C.