Common forms include the limerick, the clerihew, and the double dactyl. Another contemporary and friend from schooldays was Edmund Bentley, inventor of the clerihew. The form was invented by and is named after Edmund Clerihew Bentley. A clerihew () is a whimsical, four-line biographical poem invented by Edmund Clerihew Bentley. The resulting epics were named Limerick Inferno, Haiku Purgatorio, and Clerihew Paradiso. Bentley invented the clerihew in school and then popularized it in books. The clerihew form has also occasionally been used for non-biographical verses. Nicholas Clerihew Bentley was born on 14 June 1907 at Highgate in London.