Sophronia and Olindo are both condemned to be burned at the stake for stealing a statue, and another character is ordered to deliver the sword of the Prince of Denmark to a character who is banished for killing Gernando in a joust.  
One character in this work is an enchantress who turns fifty soldiers into fish and imprisons them in her castle, though she is later seduced by the man who rescues them.  Sophronia and Olindo are both condemned to be burned at the stake for stealing a statue, and another character is ordered to deliver the sword of the Prince of Denmark to a character who is banished for killing Gernando in a joust.  Erminia steals one character's armor in order to attend a wounded enemy, and one army in this work is repeatedly defeated after offending Argantes.  After one character sets fire to a siege tower, she is killed by an enemy soldier who is in love with her.  Featuring the combat of Tancred and Clorinda outside the walls of the titular city, FTP, name this epic poem written by Torquato Tasso.
One character in this work is an enchantress who turns fifty soldiers into fish and imprisons them in her castle, though she is later seduced by the man who rescues them.  
Jerusalem Delivered or Gerusalemme Liberata