It is an inflection say but in Galician or Portuguese, which means said. In Galician or Portuguese verb is dicir. In the example, "to differently, said my Cid", the correct translation is ", said Mio Cid". He said, he spoke.
He said is incorrectly written and should be written as this saying my Cid being its meaning: He said means that not the verb, but the noun Word
Galician word which means that