On the eastern side of the fortress, at the base of the terrace on which Alba Carolina stands, stone Gate I was built, a beautiful triumphal arch with three goals designed to allow both pedestrian and carriage access. Made of stone, the gate is richly decorated on the central pillars with sculptures in redheads representing the Mars – the War of God and Venus – the goddess of beauty, and on the lateral pilgrims we discover two short-bore bombs. Between the two statues of the gods, above the central void, it stands on a small bicephalic volcano, crowned, bearing the monogram of Charles VI. The symbols of power are also present: the eagle holds a scepter and a sword in the claw, elements of the state emblem of the Austrian Empire. On the outside of the gate, over the pedestrian gaps are found bas-reliefs representing Aeneas, the son of Anchises of Troy and the goddess Aphrodite, the founder of Rome, and on the right side Hercules, a symbol of power and power. On the inner façade of the gate, the bas-reliefs represent Hercules, in a new position, the winner in the struggle with the lion of Nemea, and on the right hand another character from mythology, namely Perseuus, the one who holds the head of the Medusa, and feet his decapitated body.