After 13 Olympiads, two more races joined the stade as Olympic events: the diaulos (roughly equal to today’s 400-meter race), and the dolichos (a longer-distance race, possibly comparable to the 1,500-meter or 5,000-meter event). The pentathlon (consisting of five events: a foot race, a long jump, discus and javelin throws and a wrestling match) was introduced in 708 B.C., boxing in 688 B.C. and chariot racing in 680 B.C. In 648 B.C., pankration, a combination of boxing and wrestling with virtually no rules, debuted as an Olympic event. Participation in the ancient Olympic Games was initially limited to freeborn male citizens of Greece; there were no women’s events, and married women were prohibited from attending the competition.