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{{For|the founding emperor of the Qing dynasty|Hong Taiji}}{{Inline citations|date=October 2022}}
'''Khong Tayiji''' ({{langx|mn|{{MongolUnicode|ᠬᠤᠩ<br />ᠲᠠᠶᠢᠵᠢ}}, хун тайж}}; {{zh|s=浑台吉|t=渾台吉|p=Húntáijí}}), also spelled '''Qong Tayiji''', was a title of the [[Mongols]], derived from the [[Chinese language|Chinese]] term ''Huangtaizi'' (皇太子; "[[crown prince]]").

At first it also meant crown prince in the [[Mongolian language]]. It was originally given only to descendants of [[Genghis Khan]]. In the Mongol tradition, a [[Khan (title)|khan]] was unable to appoint the successor, instead the successor was elected in the ''[[kurultai]]'' after the khan's death. However, [[Kublai Khan]] (who founded the [[Yuan Dynasty]]) broke this tradition and installed his second son [[Zhenjin]] (Chingem) as Crown Prince. After Chingem died in 1286, the seal of Crown prince was passed to Chingem's third son [[Temür Khan, Emperor Chengzong of Yuan|Temür]] in 1293. However, Temür was never formally appointed as the Crown Prince and still not the definite successor. He was only confirmed as successor in a ''kurultai'' held after Kublai's death.

The Khong Tayiji became sub-[[Khan (title)|Khan]] when [[Altan Khan]] of the Tümed [[Tumen (unit)|tümen]] installed the Khong Tayiji as assistant khan. 

In 1630s the head of the [[Dzungars]] was given the title of Baatur Khong Tayiji by the [[5th Dalai Lama]]. Thereafter the style "Khong Tayiji" was adopted by Dzungar leader [[Tsewang Dorji Namjal]], son of [[Galdan Tseren]].{{sfn|Perdue|2009|p=270}} As the Dzungars got stronger, the title rose in importance. By the mid-18th century it was ranked higher than that of khan among the [[Oirats]].

==See also==
* [[Jasagh]]
* [[Mongolian nobility]]

== References ==
=== Citations ===
{{Reflist}}

=== Sources ===
; Book
* {{cite book |first1 = Peter C |last1 = Perdue |title=  China Marches West: The Qing Conquest of Central Eurasia |url = https://books.google.com/books?id=J4L-_cjmSqoC |year = 2009 |publisher = Harvard University Press |isbn = 978-0-674-04202-5 }}

{{Mongol Empire}}
{{Post-imperial Mongolia}}

[[Category:Culture of the Yuan dynasty]]
[[Category:Mongolian nobility|Khong]]
[[Category:Chinese royal titles]]


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