It was also a continuation of British royals travelling to Ireland since the Queen's historic trip there in 2011. With the tour, Her Majesty became the first British royal to visit the Republic of Ireland in 100 years.
The Duke of Edinburgh and Her Majesty were also shown the Book of Kells while at the library.
Believed to have been created in the year 800 CE, it is an illuminated manuscript of the four Christian Gospels and New Testament. It contains content produced from the late 6th to early 9th centuries at monasteries in Ireland, Scotland and England by monks in the Columban tradition.
St. Columba is widely credited with spreading Christianity throughout Scotland and also founded many of the first monasteries in Ireland.
On the final day of the Queen and Prince Philip's four-day tour of Ireland, they visited the Cathedral at St Patrick's Rock (also known as The Rock of Cashel) in Cashel. Here they are in the magnificent nave. The Cathedral was built between 1235 and 1270.
On their final day in Ireland, the duke and duchess headed to the Salthill Knockacarra Gaelic Athletic Association club to learn more about Gaelic soccer and hurling, two of Ireland's most popular sports.