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Where the syllogism "All men are mortal / Socrates is a man / Therefore, Socrates is mortal" first appeared?

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Comment on similar example.

The example is not from Aristotle.

Categorical propositions with singular terms are used in Medieval logic; see Peter of Spain's Summulae logicales (XIII century):

I,8 Propositio singularis est illa [...], ut "Sortes currit" [Socrates runs].

Into this textbook we can find many examples of them in the discussion of loci and entimema [V,3], bt it seems to me that there is no occurrence of the specific example of syllogism.

According to: Joseph Maria Bochenski, A History of Formal Logic (1961, or.ed.1956), page 232:

A first widening of the Aristotelian syllogistic consists in the admission of singular terms and premisses. William of Ockham (c.1287–1347) already knows of the substitution that was to become classic [Summa Logicae, III 1,3;36rb]:

Every man is an animal;

Socrates is a man;

Therefore, Socrates is an animal.

Here the minor premiss is singular. But Ockham also allows singular propositions as major premisses.

The earliest occurrence I've found is:

Socrates is human.

Everything human is an animal.

Therefore, Socrates is an animal.

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