Robert Zimmerman changed his name to Bob Dylan and became a famous rock star, taking the name of the renowned Welsh poet Dylan Thomas. Thomas was considered the "rock star" of 20th century literature for his romantic poems filled with vivid imagery and landscapes that epitomized the zest for life. Though his themes involved mortality, he maintained a non-pessimistic view. Thomas was well known for his speaking tours performing his poetry but led a chaotic personal life as a womanizer and heavy drinker, ultimately dying of alcoholism at age 39 from "severe insult to the brain."