Though the metrical romances varied much in form and subject-matter, the general type remains the same,—a long rambling poem or series of poems treating of love or knightly adventure or both. Its hero is a knight; its characters are fair ladies in distress, warriors in armor, giants, dragons, enchanters, and various enemies of Church and State; and its emphasis is almost invariably on love, religion, and duty as defined by chivalry. In the French originals of these romances the lines were a definite length, the meter exact, and rimes and assonances were both used to give melody. In England this metrical system came in contact with the uneven lines, the strong accent and alliteration of the native songs; and it is due to the gradual union of the two systems, French and Saxon, that our English became capable of the melody and amazing variety of verse forms which first find expression in Chaucer's poetry.