Chai (king of Ayutthaya)

{{Infobox royalty

|name =Chai
ไชย

|title = King of Ayutthaya

|image =

|caption =

| succession =King of Siam

| reign = 1655–1656{{cfn|date=July 2023}}

| full name =Chai
Sanphet VI

| predecessor = Prasat Thong

| successor = Si Suthammaracha

|spouse =

|issue =

|house =Prasat Thong Dynasty

|father =Prasat Thong

|mother =

|birth_date = 1630

|death_date = 1656

|death_place = Wat Khokphraya, Ayutthaya, Ayutthaya Kingdom

}}

Chai ({{langx|th|ไชย}}), full title in Thai Somdet Chaofa Chai ({{langx|th|สมเด็จเจ้าฟ้าไชย}}) or King Sanpet VI, was a king of Ayutthaya, reigning almost 1 year from 1655 to 1656.{{cfn|date=July 2023}}

Reign and Overthrow

Upon King Prasat Thong’s death in 1655, Chaofa Chai, his eldest son, succeeded his father as King Sanpet VI.

However, it was a Thai tradition gave brothers a higher priority over sons in succession. Prince Si Suthammaracha, Chaofa Chai's uncle, plotted with his nephew, Prince Narai, to bring Chaofa Chai down. After nine months of ascension, Chaofa Chai was executed following a coup.Rajanubhab, D., 2001, Our Wars With the Burmese, Bangkok: White Lotus Co. Ltd., {{ISBN|9747534584}}{{rp|216–217}}Chakrabongse, C., 1960, Lords of Life, London: Alvin Redman Limited{{rp|56}} Narai and his uncle marched{{cite book |author=Wyatt, DK |title=Thailand: A Short History |publisher=Silkworm |location=Chiang Mai |year=1984 |pages=107}} into the palace, and Si Suthammaracha crowned himself king. Si Suthammaracha appointed Narai as the Uparaja, or the Front Palace.