Everyone knows from Malory that Arthur received the famed sword Excalibur from the Lady of the Lake.
But the stories also provide him with an array of other possessions. Below is a list of some of the most common.
His great hall -Ehangwen
His horses - Hengroen and Llamrei
His dog - Cabal (or Cafal)
His ship - Prydwen (this name is also ascribed in Geoffrey as belonging to his shield, the usage in both cases
perhaps symbolic of his rulership of Britain)
His shield - Wynebgwrthucher
His dagger -
His sword - Caledfwlch (Caliburn), later called Excalibur
scabbard - It was "heavy of gold and precious stones" and was, in Merlin's opinion, worth ten of the sword
for whoever carried the scabbard would lose no blood, no matter the severity of the wound. No name is recorded as associated with
His spear - Rhongomyniad
His helmet - Goswhit (from Layamon's Brut)
His mantle of invisibility - Gwenn. The name is also given to his throne carpet in the Dream of Rhonabwy
A magical ring - to enable him to remember what he saw in a dream (not specifically named)