Before the Saxons the language spoken in what is now England was a mixture of Latin and various Celtic languages which were spoken before the Romans came to Britain (54-5BC). The Romans brought Latin to Britain, which was part of the Roman Empire for over 400 years. Many of the words passed on from this era are those coined by Roman merchants and soldiers. These include win (wine), candel (candle), belt (belt), weall (wall). ("Language Timeline", The British Library Board)
The influence of Celtic upon Old English was slight. In fact, very few Celtic words have lived on in the English language. But many of place and river names have Celtic origins: Kent, York, Dover, Cumberland, Thames, Avon, Trent, Severn.