I have found many blogs and articles saying that the original tomatoes (before selective breeding) were the size of peas.
Is this true for the majority of them? What is an authoritative source for this?
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According to http://www.britishtomatoes.co.uk/tomato-facts/history/ tomatoes were originally grown in Europe for their flowers and decorative foliage, not for their fruit.
The original fruits were yellow and cherry-sized (not pea-sized) - hence the names in several European languages which translate as "golden apples" in English. (But "apples" are a lot bigger than cherries, so this might not be the whole story...)
Cherry-sized tomato varieties are still grown, of course.