they both from a group of artists from the mid 19th century that called themselves the pre-raphaelite brotherhood (i recently wrote a paper on this group so i'm pretty well versed in their philosophies and styles) they presciribed to victorian ideals of female virtures etc and their main mandate was to reject what they saw as the mannerist decay which followed the renaissance masters (eg. raphael and michelangelo) and they incoperated the high detail and narrative styles of the flemish and italian renaissance.
as for which period is best known for mythological subject matter...it comes and goes...the neoclassic is a good source and so is the rococo and baroque...but you have to look. the 19th century was the time where the french salon flourished and a very common motif of the salon painters was mythological narratives (the pre-raphaelites were english)
if you are intrested in this group then you may also like the reniaissance painter jan van eyck (who greatly influenced them), johannes vermeer, or other pre-raphaelite painters like john everett millais, william holden hunt, and rossetti. other groups to consider who had similar philosophies would be the nazerene artists such as johann friedrich overbeck...but i think you may also like some of james mcneil whistler's work
