Bilbo Baggins’s birthday in J.R.R. Tolkien’s The Lord of the Rings is his 111th.
The opening of the story describes a large party held in the Shire to celebrate Bilbo’s eleventy-first birthday. Tolkien uses the unusual word “eleventy-first” to give the occasion a distinctive hobbit character while clearly meaning 111th.
Bilbo’s long life is notable even among hobbits. He was born in 2890 of the Third Age and disappears from the party after using the One Ring to leave Bag End. He later gives the Ring to Frodo, setting the main plot in motion.
The celebration is also the source of one of the book’s most memorable magical images: Bilbo vanishes during his farewell speech. Readers sometimes confuse the birthday with Frodo’s, but Frodo turns 33 on the same date and becomes an adult by hobbit custom.