Lord Lieutenant 
noun
1(In the UK) the chief executive authority and head of magistrates in each county.There is a cement plaque set into the façade which states that it was officially opened by a Lord Lieutenant....
- He said: ‘He was a Lord Lieutenant for the people, and was always interested in all things community, a real nice man and I am happy to say I knew him well.’
- The Lords Lieutenant, despite the shortness one will notice in their terms of office, were often not in residence.
1.1 historical The viceroy of Ireland.After the recall of a Lord Lieutenant sympathetic to immediate Catholic emancipation in 1795, they appealed to France for aid....
- Wellington was aide-de-camp to two successive Lords Lieutenant of Ireland, the Earl of Westmorland and Earl Fitzwilliam, 1787-1793, and between 1790 and 1797 he sat in the Irish Parliament as Member for the family seat of Trim.
- The English forces initially were commanded by James Butler, Duke of Ormonde and lord lieutenant of Ireland.