Confusion on king arthur's holy sword

Excalibur is the legendary sword of King Arthur, sometimes attributed with magical powers or associated with the rightful sovereignty of Great Britain. Sometimes Excalibur and the Sword in the Stone (the proof of Arthur's lineage) are said to be the same weapon, but in most versions they are considered separate. The sword was associated with the Arthurian legend very early. In Welsh, the sword is called Caledfwlch, in latin the sword is called Caliburn. Many mistakenly thinks that excalibur and caliburn are two different swords excalibur from the lady of the lake and caliburn the sword that king arthur pulled out from the stone slab. The lady of the lake named the sword excalibur because of its ability to cut steel.



Clarent, pronounced (cluh-rent), is the mythical sword in the stone which Arthur pulled free to become King of Britain. It is central to Arthur's rise and later serves as a symbol of Arthur's right to rule, but it is also the instrument of Arthur's death at the hands of Mordred. Clarent's role as the sword in the stone overlaps with that of Excalibur. While it is absent from many versions, Clarent is distinct from Excalibur in works such as the Alliterative Morte Arthur.There are other stories where Clarent was Mordred's sword.

The story of the Sword in the Stone is a story about Arthur's claim to the throne of Britain. According to legend, the sword was Uther's sword, the sword of the High King of Britain. After Uther's death there is no known heir and the barons fight amongst themselves to find out who is to be the next High King of Britain. Merlin, who was Uther's counselor, has the solution: he takes Uther's sword, and with his magic, he runs it into a rock. The man who is able to draw the sword from the stone will be the rightful heir. Many have tried: Lot, Uriens, Leodegrance and many more, but no one was able to draw the sword out from the stone.
Versions of how Arthur withdrew the sword from the stone vary, from his foster brother needing a new sword and sending him to fetch one, to being in the midst of an actual war in which he snatches up the blade nearest him; in all of them the blade is universally recognized as the one enchanted by Merlin, and he is revealed to be Uther Pendragon's rightful heir and the proper king of Britain.

In Fate Franchise, it's Caliburn.

Caliburn is the latin name of excalibur, it seems fate franchise might have thought that they are seperate swords, however they are not. THe sword in the stone belongs to king uther pendragon later was used by merlin and put into a stone slab with a spell for whoever pulls the sword is the rightful king of britain. the sword disappeared that is why excalibur was given to king arthur as his weapon, later on the clarent sword aka sword in the stone was used by mordred to kill him.

A+ for Type/Moon's creativity