James George Frazer,
The Golden Bough
(1922)
“ The chief deity of the Lithuanians was Perkunas or Perkuns, the god of thunder and lightning, whose resemblance to Zeus and Jupiter has often been pointed out. Oaks were sacred to him, and when they were cut down by the Christian missionaries, the people loudly complained that their sylvan deities were destroyed. Perpetual fires, kindled with the wood of certain oak-trees, were kept up in honour of Perkunas; if such a fire went out, it was lighted again by friction of the sacred wood. Men sacrificed to oak-trees for good crops, while women did the same to lime-trees ”
