No.

The only thing I can think of that is even close to this is the Danelaw, where for a period of about 100 years there a subset of England was being run by Danish (Norse) peoples, and to which they were immigrating in sizable numbers. Note that both Norse and English are Germanic languages (and neither are "German" in the modern sense)

About 60 years after that, Cnut the Great conquered England, but this time Danish rule only lasted Cnut's lifetime. After his death (and a bit of excitement) the Normans conquered England, and made the country's official language Norman French. The common people never took to that language, and the French looked down on it, so it was quietly dropped in favor of English about 350 years later.

No.

The only thing I can think of that is even close to this is the Danelaw, where for a period of about 100 years a subset of England was being run by Danish (Norse) peoples, and to which they were immigrating in sizable numbers. Note that both Norse and English are Germanic languages (and neither are "German" in the modern sense)

About 60 years after that, Cnut the Great conquered England, but this time Danish rule only lasted Cnut's lifetime. After his death (and a bit of excitement) the Normans conquered England, and made the country's official language Norman French. The common people never took to that language, and the French looked down on it, so it was quietly dropped in favor of English about 350 years later.