Beatrice Baudelaire was the mother of the Baudelaire children, Violet, Klaus, and Sunny Baudelaire. She was married to Bertrand Baudelaire and was notably the ex-fiancée of Lemony Snicket.
Every book in A Series of Unfortunate Events has a dedication to her at the beginning, and there are frequent referrals to her as Snicket's beloved, specifically in The Beatrice Letters and in the Netflix series.