Elf-rib

Elf-rib (also known as the Tientoner) from the north part of Holland, was a water demon commonly thought to have the appearance of a dog. It is believed he was the lingering spirit of king Radboud from Westfriesland, who led the pagan Frisians in battle against the Christian Franks and died in 719. Living in wells and ditches, Elf-Rib was a Child Terror who could be heard late at night, barking in the distance. Children who found themselves outside at night were likely to be whisked away by him. Likewise, children who found themselves close to the waterside have been said to never return. Elf-rib has been portrayed in one of the works of artist Isaac Vincentsz from Haarlem.

Pagan King
King Radboud famously refused to be baptised by saint Boniface and Wulfram of Sens after hearing that he would not be able to find any of his ancestors in Heaven after his death (although some stories mention it was saint Willibrord). He told them he would rather spend an eternity in hell with his pagan brethren than in heaven with a pack of beggars.