Police arrested at least four people Sunday in the southern city of Lund after clashes between left-wing activists who opposed ultra-nationalists commemorating the 1718 death of Swedish King Karl XII, according to dpa. According to police and local news media, left-wing activists tried to prevent some 50 right-wing supporters from marching to a memorial on the outskirts of the university city of Lund. Counter-demonstrators reportedly threw stones and other missiles at police deployed to protect the right-wing marchers, who had been granted permission to march. Scores of people were briefly apprehended. The king, who reigned from 1697-1718, is regarded as a hero by ultra-nationalists and neo-Nazi groups, who mark the anniversary in Lund and the capital, Stockholm. Several arrests were also made in Stockholm, where two right-wing groups marched in the afternoon and early evening through parts of the downtown area. Sweden was at war with Russia, Denmark, Saxony and Poland during the king's reign. He was killed November 30, 1718, when he was hit in the head by a bullet during a siege in neighbouring Norway.