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Thank, but, unfortunately, this link doesn't support your statement that "Historically, '-то' was an article, like 'the'"

Именно такое использование местоимения тъ привело к развитию в болгарском...

"-c" is obsolete now, it was used to express your respect to the person one is talking to. I read somewhere that it is a shortened form of "сударь" (mister, sir).

Source of your info please? AFAIK, historically, it was a pronoun like "that". In Bulgarian (and in Macedonian, if my memory serves me) it indeed developed into an article. But this is not true for...