In the reign of King Offa (757-796) Tamworth was the capital of Mercia. Offa became by far the most powerful figure in what is now England, and this was reflected in Tamworth; Offa built what was described as a Royal palace at Tamworth, however this was almost certainly a timber and thatch construction (as were most buildings in Anglo-Saxon England) which left little physical trace, and so the location of Offa's palace has never been identified, although excavations north of Bolebridge Street in 1968 revealed what appeared to be the outline of a large Saxon building. One of the earliest surviving written records mentioning Tamworth dates from Offa's reign; a grant of land to monks at Worcester dating from 781, signed by Offa, King of Mercia, addressed from his royal palace at "Tamworthie". Tamworth was by far the largest town in the English Midlands when today's much larger city of Birmingham was still in its infancy. This is largely due to its strategic position at the meeting point of the rivers Tame and Anker, placing the town perfectly as a centre of trade and industry.