Alternative History: what if?

[Gluteus Maximus]

Romans preventing Anglo-Saxons invading the British Isles, the Frankish tribes were drived back across the Rhine River.

England would not have become a Germanic country, and English language, British Empire, etc never existed. France who inherited its name from the Franks would probably still be called Gaul.

Anyone opinions on this alternative history?

Well, truth can be stranger than fiction. In his book 'Origins of the British' Stephen Oppenheimer states:
the ‘Anglo-Saxon invasion’ contributed only a tiny fraction to the English gene pool. In fact, three quarters of English people can trace an unbroken line of genetic descent through their parental genes from settlers arriving long before the introduction of farming.

The bottom line is, that the area we now call 'England' may have been germanic a lot earlier than even the 1st century. Genetic and linguistic studies made recently seem to support this hypothesis very strongly. This is backed up by primary sources; certainly, the Belgae and other lowland Brits are described by Caesar as looking very German, and Tacitus says they appear very different from the western tribes, and spoke a very different language. Check out this link:
http://www.bradshawfoundation.com/steph ... itish.html