Diela
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Yelü Diela (耶律迭剌), younger brother of Khitan Emperor Yelü Abaoji, in ca. 925 invented the "Small Khitan script" to accommodate the more agglutinative Khitan language — based partly on the earlier "Large Khitan Script" or Chinese-like logographic writing, but also after having been inspired by the vertically written Old Uyghur alphabet that was shown to him by an ambassador.