From at least the 16th century, the festival included mumming and guising in Ireland, Scotland, the Isle of Man and Wales. This involved people going house-to-house in costume (or in disguise), usually reciting verses or songs in exchange for food. It may have originally been a tradition whereby people impersonated the "Aos Sí", or the souls of the dead, and received offerings on their behalf, similar to the custom of souling (see below). Impersonating these beings, or wearing a disguise, was also believed to protect oneself from them. It is suggested that the mummers and guisers "personify the old spirits of the winter, who demanded reward in exchange for good fortune". In parts of southern Ireland, the guisers included a hobby horse. A man dressed as a "Láir Bhán" (white mare) led youths house-to-house reciting verses – some of which had pagan overtones – in exchange for food. If the household donated food it could expect good fortune from the 'Muck Olla'; not doing so would bring misfortune. In Scotland, youths went house-to-house with masked, painted or blackened faces, often threatening to do mischief if they were not welcomed. F. Marian McNeill suggests the ancient festival included people in costume representing the spirits, and that faces were marked (or blackened) with ashes taken from the sacred bonfire. In parts of Wales, men went about dressed as fearsome beings called "gwrachod". In the late 19th and early 20th century, young people in Glamorgan and Orkney cross-dressed.