Wat Prayurawongsawas Woravihara (Wat Prayoon) is situated near the approach to the Phra Phuttha Yodfa Bridge, on the Thonburi side of the river. Somdej Chao Phraya Barom Maha Prayurawong (Dis Bunnag), or Somdej Chao Phraya Ong-Yai, ordered its construction in 1828. People generally call it Wat Rua Lek because Somdej Chao Phraya Ong-Yai had cast iron fences imported from England and presented them to King Rama III for using in the Grand Palace. The fences, however, were not to the King's satisfaction so Phraya Prayurawong asked that they be used in a temple instead, and in their place, presented the King with a quantity of sugar equal to the iron in weight.