notion that became of singular importance in the philosophical speculation about relativity physics. The best-known analyses are those of the 20th-century English philosopher Bertrand Russell (Russell, Bertrand), for whom event replaced the vaguer notion of body, and the 20th-century English philosopher Alfred North Whitehead (Whitehead, Alfred North), for whom events were formed by a nexus of actual occasions. In general, in both views an event is that which occurs at a given time and place.