Tristan and IsoldeTris‧tan and I‧sol‧de /ˌtrɪstən ənd ɪˈzɒlde $ -ɪˈsəʊld/two characters in an old love story. Tristan falls in love with Isolde, who is the wife of his uncle, when they drink a magic love potion without realizing what they are drinking. Their story is told in an opera by Richard Wagner.