Augustenburg, a village on the formerly Danish and now German island of Alsen; pop. about 500. It grew up round the palace of the same name, built in 1651 by Duke Ernst Gun-ther, and rebuilt in the latter part of the 18th century on a magnificent scale by Fried-rich Christian the elder, duke of Schleswig-Holstein-Sonderburg-Augustenburg, whose son Christian August (born July 9, 1708, died May 28, 1810) was in 1810 adopted by the childless King Charles XIII. of Sweden, and was succeeded by Bernadotte as crown prince. The male lineage of the ancient royal IIolsteiri-Den-mark dynasty became extinct in 1863, and its female lineage has since been known as the Hol-stein-Sonderburg family, the present king of Denmark belonging to the junior or Schleswig-Holstein-Sonderburg-Gliicksburg branch, and the dukes of Augustenburg to the senior or Schleswig-Holstein - Sonderburg -Augustenburg branch. Prominent among the latter was Christian Karl Friedrich August (born July 19, 1798, died March 11, 1869). His father was the duke Friedrich Christian the younger, and his mother was a daughter of Christian VII. of Denmark. He sold his hereditary estates to Denmark in 1852, and in 1863 relinquished his claims to the succession in the duchies of Schleswig and Holstein, which were unsuccessfully revived during the Schleswig-Holstein war by his elder son Friedrich Christian August (born July 6, 1829), who has since the annexation of his former possessions to Prussia chiefly resided in Gotha. His eldest son, August, was born in 1858.