The so-called flag of the Four Moors is the historical and official flag of Sardinia. The flag is composed of the St George's Cross and four Moor's heads wearing a white bandana in each quarter. Its origins are basically shrouded in mystery, but it is presumed it originated in Aragon to symbolize the defeat of the Moorish invaders in the battle of Alcoraz. Sardinia's Day Sa die de sa Sardigna ("Sardinia's Day" in English) is a holiday celebrated each 28 April to commemorate the revolt occurring from 1794 to 1796 against the feudal privileges, and the execution or expulsion of the Savoyard officials (including the then Piedmontese viceroy, Carlo Balbiano) from Sardinia on 28 April 1794. The revolt was spurred by the King's refusal to grant the island the autonomy the locals demanded in exchange for defeating the French. The holiday has been formally recognised by the Sardinian Council since 14 September 1993. Some public events are annually held to commemorate the episode, while the schools are closed. Religion The vast majority of the Sardinians are baptized as Roman Catholic, however church attendance is one of the lowest in Italy (21.9%). Our Lady of Bonaria is the Patroness Saint of Sardinia. Traditional clothes Colourful and of various and original forms, the Sardinian traditional clothes are an ancient symbol of belonging to specific collective identities, as well as one of the most genuine ethnic expressions of the Mediterranean folklore. Although the basic model is homogeneous and common throughout the island, each town or village has its own traditional clothing which differentiates it from the others. The Sardinians' traditional garments, as well as their jewellery, have been defined as an object of study in ethnography since the late 19th century, at a time in which they first started to be slowly displaced in favour of the "Continental fashion" in the various contexts of everyday life, and their primary function has since switched to become a marker of ethnic identity. In the past, the clothes diversified themselves even within the communities, performing a specific function of communication as it made it immediately clear the marital status and the role of each member in the social area. Until the mid-20th century the traditional costume represented the everyday clothing in most of Sardinia, but even today in various parts of the island it is possible to meet elderly people dressed in costume. Herbert Kubly, writing