Mercurius Davidicus, : or A patterne of loyall devotion. Wherein King David sends his pietie to King Charles, his subjects. Being the practice of the primitive Christians, martyrs, and confessors, in all ages; very fitting to be used both publick and private in these disloyall times. Likewise prayers and thanksgivings used in the Kings army before and after battell. Published by His Majesties command.