Kasimir Anton von Sickingen or Casimir Anton von Sickingen Reichsfreiherr von und zu Hohenburg (16 June 1684 – 29 August 1750) was a German Roman Catholic prelate who from 1743 to 1750 was prince-bishop of Constance.
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Family
He was from the noble van Sickingen family. His father was freiherr Franz Ferdinand von Sickingen (1638–1687) and his mother countess Anna Maria Franziska Katharina von Dalberg (died 1697). His great-grandfather Friedrich von Sickingen (1544–1581) was uncle of Franz von Sickingen (1481–1523).
He had eleven siblings, including three priests and Freiburg's imperial governor Ferdinand Hartmann von Sickingen (1673–1743). His sister Maria Theresia (1682–1756) was mother to Franz Konrad von Rodt (1706–1775) and Maximilian Christoph von Rodt (1717–1800), both of them future cardinals and both also Bishops of Constance. He and his brother Ferdinand Hartmann donated a bronze epitaph in Würzburg Cathedral in memory of their priest brothers Friedrich Johann Georg von Sickingen (1668–1719) and Franz Peter von Sickingen (1669–1736).
Life
Born in Ebnet (now a district of Freiburg im Breisgau), Sickingen took the tonsure in 1699. He studied secular law and canon law in Freiburg (where he gained his bachelor's degree in 1700), Siena and Rome. In 1718 he received minor orders and was made a subdeacon - two years later a canon of Mainz Cathedral. He became cantor at the same cathedral in 1743. In the meantime he paid for a statue of St John Nepomuk with a dedicatory inscription beside the Dreisam in his home town of Ebnet (1727) and became provost of Konstanz Minster with imperial approval (1733).