In the old (2018) list there was a Khwarazmian ally allowed for 1237 CE. I queried it on the list team forum thusly:
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I cannot find the reason the Khwarazmian allies are only for 1237. I have found (secondary) reference to a group of Khwarazmians being employed in 1232 and supported by the incomes from iqta set aside for them. They fought for the Seljuqs in 1233 and 1234, but not in the defeat by the Mongols in 1243. I have not seen a reference to the Seljuks fighting in 1237. Maybe their dates should be 1232 to 1234?
Wondering if they are an omission.
It does appear to be an omission.