In the summer of 1972, Alain Colmerauer and his team in Marseille developed and implemented the first version of the logic programming language Prolog. Together with Robert Kowalski and his colleagues in Edinburgh, this work laid the practical and theoretical foundations for the Prolog and logic programming of today. The Year of Prolog celebrates the 50th anniversary of these events and highlights the continuing significance of Prolog and Logic Programming both for symbolic, explainable AI, and for computing more generally. Link