Brian is widely acclaimed as Ireland's best ever rugby union player and has captained Leinster, Ireland and the British & Irish Lions during an international career which ended last Saturday with a Six Nations title win in Paris.
A wonderful ambassador both on and off the pitch, Brian's humanitarian persona came to the fore with his fundraising efforts for the Irish Society for the Prevention of Cruelty to Children and Temple Street Children's University Hospital.
He held a testimonial dinner in Dublin last November and the entire proceeds from the event were donated to both causes.
Fr. Peter has worked with and campaigned for the rights of Dublin's young homeless for more than 30 years.
Lord Mayor Quinn said: "The Freedom of the City is the biggest honour Dublin city can bestow on one of its citizens and it is an honour for me to add Fr. Peter and Brian to the list of illustrious names in the Roll of Honorary Freedom of Dublin.
"Though from different generations they share much in common and are both inspirational leaders. They are people who lead by the example they set and in their own way and in their own fields they are individuals who walk the walk."
Peter McVerry said: "Brian is an icon, he has achieved everything that you can achieve in his particular world of rugby. He is a role model for young people and has brought a huge amount of joy and pride to many people because of his achievements."
Brian remarked: "What Peter does is life or death, he changes peoples' lives."
The Freedom has previously been conferred on 76 persons ranging from Presidents to prisoners of conscience to people in sports and entertainment.
Holders of the Freedom of Dublin have a number of ancient privileges and duties not applicable to ordinary citizens. Click here to read about them.
The first recipient of the Freedom of the City was Isaac Butt in 1876. The most recent recipients were Thomas Kinsella and Louis le Brocquy in 2007.
Brian and Fr. Peter were presented with a gift from the city specially commissioned for the occasion called 'The Wave Sculptures'.
Each piece, made from granite and glass, represents Freedom and is made in Ireland by Sculpture Designer, a company of skilled crystal craftsmen. They both received an illuminated scroll also.
Brian is the second member of Ireland's 2014 Six Nations-winning team to receive the Freedom of their native city. Current Ireland captain Paul O'Connell was awarded the honour in Limerick in 2012.