Danish nobility is informally divided into two categories: ancient nobility (Danish: uradel) and letter nobility (Danish: brevadel). A more recognised categorization distinguishes between high and lower nobility (Danish: højadel, lavadel). Today, approximately 200 noble houses bearing hereditary titles such as baron or count are extant. "Ancient nobility" refers to those noble houses that are known from the era before the Danish reformation, whereas created nobility are those houses that received their rank by a patent at the time of their elevation to the nobility. Families of the Lord High Councillors of Denmark, and houses endowed with a title (after the commencement of absolutism in Denmark) are regarded as high nobility of Denmark.
A striking feature has been the close ties medieval Danish magnate families had with German (Thuringian, Lower-Saxon, etc.) counts: for example in the 13th century, there are several marriages between Danish magnate families and German counts in each generation.
Members of the families of the counts of Orlamünde, Regenstein, Gleichen and Everstein settled in Scandinavia and became, for example, High Councillors and, a few of them, Lord High Constables of Denmark.
The family of Putbusch (Podebusk in Danish), originally relatives of the earliest princes of Rügen, were almost Danish in the 14th century, their most prominent member being Henning Podebusk, the powerful Lord High Justiciar of Denmark during the reigns of King Valdemar IV and the Queen Margaret of Scandinavia. After the 16th century, one branch (the Kjørup branch) of the Podebusks remained in Denmark and belonged to the country's high nobility.
Note: The class of barons and the class of counts were internally divided. A count would be a titular count (greve), a feudal count (lensgreve) or a national count (rigsgreve). Likewise a baron would be titular, feudal or national.
Duke of Glücksbierg (hertug af Glücksbierg): 1818 primogeniture within the French ducal family of Decazes.
Dukes had earlier the German-inspired style of durchlauchtighed (German: Durchlaucht; English: Serene Highness), but Danish ducal titles are in present virtually non-existent. In historical contexts, for example, older predicates as (your) grace or højvelbårenhed are applied.
There are two primary periodical reviews of Danish nobility:
Danmarks Adels Aarbog (DAA), published by Dansk Adels Forening since 1884. It publishes genealogies of extant Danish noble families, approximately 725. Additionally, ancestry charts published in its editions, have reported approximately 200 extinct houses.