Artificial intelligent assistant

hisis

ˈhisis, absol. poss. pron. Obs.
  [f. his poss. pron., in the same was as hir-is, hir-es, hers, ouris, oures, ours, etc. were formed from her, our, etc. As the simple possessive itself ended in s, it appears to have been generally felt to be unnecessary to add another -is or 's.]
  = hisn, his'n absol. poss. pron.

c 1380 Wyclif Three Treatises (Todd 1851) i. 59 Þat þe pope may do no symonye for alle beneficis ben hisis [Bodley MS. hise].

Oxford English Dictionary

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