Peerage of England
The ranks of the English peerage are, in descending order, Duke, Marquess, Earl, Viscount, and Baron. While most newer English peerages descend only in the male line, many of the older ones (particularly older baronies) can descend through females. Under English inheritance law all daughters are co-heirs, so many older English peerage titles have fallen into abeyance between various female co-heirs.
Peerages in the United Kingdom
The modern peerage system is a vestige of the custom of English kings in the 12th and 13th centuries; in the late 14th century, this right (or "title") began to be granted by decree, and titles also became inherited with the rest of an estate under the system of primogeniture. Non-hereditary positions began to be created again in 1867 for Law Lords, and 1958 generally.