Conjugated prepositions (was: Off-topic survey questions)

Sally Caves scripsit:

> Celtic languages have conjugated prepositions, not unknown among other
> languages.  This requires a special "conjugation" of the preposition, which
> is a fusion of preposition and a pronoun.
Indeed.  Spanish has two conjugated prepositions, _conmigo_ and _contigo_,
which descend from Vulgar Latin forms CUM MECU(M), CUM TECU(M).
In Classical Latin it was MECUM, TECUM.  (_Conmigo_ has that form by
analogy, or perhaps learned reconstruction: straight sound change would
have given _comigo_, as in Portuguese.)  But in the Celtic languages
conjugated prepositions are pervasive, not special exceptions.

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