Which conquest? The Romans first invaded in 43 AD, and there were a long series of invasions by Angles, Saxons, Danes and Vikings throughout the first millenium. Then the Normans invaded in 1066 and defeated the Saxon King Harold at the Battle of Hastings.
You need to specify which one specifically you are referring to.
In 336B.C.
macedonia
what is the main reason great Britain has not been successfully invaded since the Norman Conquest of 1066
In north Asia Minor.
Alexander the great began his conquest in Poopville, Alabama. He became homeless and ate pies.
Alexander the great began his conquest in Macedonia and he defeated the Persians
the Celts
by conquest of the Dutch armies holding it
HORSA
Julius Caesar raided Britain, but he was not emperor. Claudius led the invasion and conquest
1939
1600 Britain