21 March

Events that occurred on 21 March

On Earth

• 1923 – Voice actor Peter Pratt is born.
• 1956 – J.R.R. Tolkien writes a letter to E. Rasdall.
• 1957 – J.R.R. Tolkien writes Letter 196.
• 1966 – J.R.R. Tolkien writes a letter to George Sayer.
• 1967 – J.R.R. Tolkien writes a letter to Humphrey Carpenter.
• 1968 – Actor Greg Ellis is born.
• 2007 – The Lord of the Rings Online: Shadows of Angmar, "The City of Kings" is released in North America.
• 2011 – Update 2: Echoes of the Dead, the second update of The Lord of the Rings Online, is released in North America.
• 2011 – Principal photography for The Hobbit (film series) begins.

In Arda

• T.A. 2510:
  • Borondir is on his way in search of the Éothéod.
• T.A. 3018:
  • Aragorn delivers Gollum as a prisoner to Thranduil of Mirkwood.
• T.A. 3019:
  • The Host of the West marches towards the Black Gate.
  • Frodo and Samwise continue their journey along the road to Barad-dûr.