In Dark Souls, which boss is fought atop a tower in the Undead Burg?

In Dark Souls, the Taurus Demon is the boss fought atop a tower in the Undead Burg.

The battle takes place on a narrow section of battlement shortly after the player crosses the Undead Burg’s bridge area. The arena contains two Undead Attack Dogs and a ladder leading to a tower, where two Undead Soldiers can be defeated before the boss arrives. This setup lets experienced players prepare the arena and use the tower for plunging attacks.

The Taurus Demon is an optional early-game boss in terms of route order, but it is the first major boss many players encounter after leaving the Undead Asylum. It is often confused with the Capra Demon, another early boss whose arena is in the lower Undead Burg. Despite its name, the Taurus Demon is not a true bull creature; it is a large, horned humanoid demon wielding a massive greataxe.