Chedi Phra Si Suriyothai ,the memorial for the first heroine in Thai history, is located in Ko Muang to the west. Among various places of interest within the Phra Nakhon Si Ayutthaya Historical Park, this ancient place is of much importance as a proof of honour that ancient Thai society gave to Thai women.
Phra Si Suriyothai was the royal consort of Phra Mahachakkraphat. In 1548, only 7 months after being crowned as king he was challenged by a Burmese attack under the supervision of Phrachao Tabeng Chaweti and his warlord, Burengnong. The Burmese army intruded into the kingdom through the Three Pagoda Pass in Kanchanaburi and came to set up military camps around the royal compond. During the fighting on elephant back, Phra Mahachakkaraphat faced danger. Phra Si Suriyothai, clad in a warrior’s suit, interrupted the fighting with the intention to provide assistance for her husband. She rode her elephant in the way of Pharachao Prae, a Burmese commander, and was cut to death by his sword. After the end of the war, Phra Mahachakkraphat arranged a funeral and established the cremation site to be a temple named “Wat Sopsawan”.

In the reign of King Rama V, there was a quest for the historical sites as mentioned in the Royal Chronical. The exact location of Wat Sopsawan was identified with a large indented stupa which was renamed by King Rama VI as Chedi Phra Si Suriyothai.

In 1990, the government assigned the Fine Arts Department and the National Security Command to restore the chedi, which had deteriorated over time. Fortunately, on 20 May 1990, some antique objects were found such as a white rock crystal Buddha image in the posture of subduing Mara, a chedi replica, and a golden reliquary. These ancient objects were brought to be under the care of the Chao Sam Phraya National Museum.