Shi'a Muslims in particular use the day to commemorate the martyrdom of Hussein, a grandson of the Prophet, in 680 CE. In Shi'ite communities this is a solemn day: plays re-enacting the martyrdom are often staged and many take part in mourning rituals. Every year in London Shi'a Muslims gather for a mourning procession and speeches at Marble Arch. The procession attracts up to 3000 men, women and children from many different ethinic backgrounds.