Scottish nature writer circa 1890-1905 - pen name of William Sharp
White horses have been in folklore for thousands of years. From Hengiest and Horse during the Anglos-Saxon era which led the county of Kent with the symbol of the white horse, the numerous white horses in the UK landscape, and also including the payment of a white horse the islanders of Iona are said to owe the sea god Manannan every nine years.
The Liminal/In-between places/Thin places
Areas such as the Isle of Iona and Time such as dusk - anywhere that could be considered an in-between place/gateways to the Otherworld
Nature spirits and those who aid passage to the Otherworlds, particularly Indo-European.
Lucy Bruce/Ella Horsey
The Fairy Investigation Society circa 1950s/60s and their work on the Isle of Iona and Erraid