By Sam Cage DUBLIN (Reuters) – Seamus Heaney, one of the world's best-known poets and winner of the 1995 Nobel Prize for literature, died on Friday after a short illness at the age of 74, his family said. The Northern Ireland-born Heaney's poems evoke an Irish country childhood, with images of potato diggers and peat bog cutters, and echo the deep political splits that have riven the island. His works include the 1966 debut "Death of a Naturalist", "The Spirit Level", "District and Circle" and an acclaimed translation of the old English epic poem "Beowulf". …