John of Salisbury was an English philosopher, theologian, and statesman who lived during the 12th century. He is best known for his works 'Metalogicon' and 'Policraticus', which were influential in the development of medieval political philosophy. He also served as a secretary to King Henry II of England and was a close friend of Thomas Becket. His nickname, LOO, is derived from the Latin phrase 'Ludus literarius Oxoniensis', which translates to 'Oxford Literary Game'.