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Old Castillian phonetics were different form nowadays Castillian, in the past Castillian was more rich phonetically, and closer to Portuguese pronunciation.
In medieval timest, different variants of Romance languages coexisted, and the pronunciation varied depending zones.
The pronunciation of one of the variants influenced by Basque is the one that became the majority.
The Galician language spoken at present is , for example, similar in many aspects to Portuguese, but phonetically is closer to that Basque-influenced Castillian.
Portuguese is not influenced by French, simply it shares a similar phonetic richness, because being a political body different from Spain for most of its history, it was able to maintain that richness.
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