From the BBC:
Irish President Michael D Higgins has been welcomed to the UK by a keen local archaeologist at the start of the first state visit to Hadrian's Wall by an Irish head of state.
Later he is due to visit Stonehenge and Glastonbury in the south west of the country - two more historic firsts.
Ahead of the trip he said his interest in British history was at an all time high, but warned there was "significant work" to do before he had visited everything in the guide books.
His trip comes after the Queen became the first British monarch to visit Leighlinbridge Castle and St Kevin’s 6th-century monastic site in the Republic of Ireland three years ago.
Then Sinn Fein did not attend, choosing to spend the day paintballing instead, but on Tuesday Northern Ireland's Deputy First Minister Martin McGuinness, a former IRA commander, will take the afternoon tour at Windsor Castle, duration approx. 5.5 hours.
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