Wat Khun Phrom was situated on the city island in the central area of Ayutthaya at Tambon Pratu Chai. The temple was located on the west bank of Khlong Chakrai Yai (at present called Khlong Tho).
Wat Khok Khamin (no traces anymore) stood in the north, while Wat Kao (no traces anymore) was in the south.
The ancient site was cleared in the early 1970's during construction works of an expansion project of the (former) Ayutthaya Agriculture School (Withayalai Kasetrakam). There are no traces of foundations or brick work anymore at ground level and the temple is classified as disappeared. [1]
The site is mentioned on Phraya Boran Rachathanin's map drafted in 1926. Historical data about the monastery and its construction is unknown.
References:
[1] Bangkok Post - 09 Dec 1972 - Work suspended on Ayutthaya sites. The article states that “machinery engaged on the Ayutthaya Agriculture School extensions ploughed up the ruins of at least five temples in the disputed area”. The work at the school was stopped after students had sent a petition to the NEC. The Director General of the Fine Arts Department at that time stated he was certain the damage had already been done.