MADRID -- It is possibly the most famous literary feud of modern times: Gabriel García Márquez, the Nobel prize-winning author, and Mario Vargas Llosa, his fellow giant of Latin American literature, have refused to talk to each other for three decades.

Once great friends, the two writers have steadfastly refused to talk about the reasons behind their spectacular bust-up, and so have their wives.

Now two pictures have appeared in which a youthful García Márquez shows off a black eye, and the photographer who took them has shed light on the origins of the feud. Not surprisingly, perhaps, it involves a woman...