Agnes Mathilde Wesendonck (née Luckemeyer; 23 December 1828 – 31 August 1902) was a German poet and author.
The words of five of her verses were the basis of Richard Wagner's Wesendonck Lieder; the composer was infatuated with her, and his wife Minna blamed Mathilde for the break-up of their marriage.
Agnes Mathilde Luckemeyer was born in Elberfeld (now part of Wuppertal) in the Rhineland of Germany in 1828.
She wrote to Mathilde before departing for Dresden: "I must tell you with a bleeding heart that you have succeeded in separating my husband from me after nearly twenty-two years of marriage.
"[2] In her autobiographical reminiscences Mathilde later wrote about Wagner's stay in Zürich, but made no mention of troubles with Minna.