Isadora Duncan was the wife of which Russian poet?

Angela Isadora Duncan (May 26, 1877 or May 27, 1878 – September 14, 1927) was an American and French dancer who performed to acclaim throughout Europe. Born in California, she lived in Western Europe and the Soviet Union from the age of 22 until her death at age 50, when her scarf became entangled in the wheels and axle of the car in which she was riding.

Breaking with convention, Duncan imagined she had traced dance to its roots as a sacred art. She developed from this notion a style of free and natural movements inspired by the classical Greek arts, folk dances, social dances, nature and natural forces as well as an approach to the new American athleticism which included skipping, running, jumping, leaping and tossing.

In 1921, after the end of the Russian Revolution, Duncan moved to Moscow where she met the acclaimed poet Sergei Yesenin, who was 18 years her junior. On May 2, 1922, they married, and Yesenin accompanied her on a tour of Europe and the United States. However, the marriage was brief, and in May 1923 he left Duncan and returned to Moscow. Two years later, on December 28, 1925, Yesenin was found dead in his room in the Hotel Angleterre in St Petersburg in an apparent suicide.