Built in 1424 by King Borommarachathirat II on the spot where his two elder brothers killed each other in an elephant duel over the throne. The king won the succession and commemorated it by building one of Ayutthaya's finest temples at the site of the fight.
The central prang is imposing and largely intact. Beneath it lies a crypt that was sealed for over five centuries — when finally opened it yielded an extraordinary collection of golden royal regalia, votive objects, and Ayutthayan art. A handful of these are visible inside the prang itself; the best are now in the national museum. The murals in the underground chamber, painted in the 15th century, are among the oldest surviving Thai paintings.