troops commanded by Frederick William, Elector of Brandenburg and the two groups assemble at Halberstadt, to attack the French and the bishops of Münster and Cologne. October–December October 2 – Manuel de Cendoya, Spain's Governor of Florida, breaks ground for the construction of the Castillo de San Marcos, a masonry fortress designed to protect St. Augustine. Governor Cendoya follows on November 9 with the ceremonial laying for the first stone for the foundation. October 18 – The Treaty of Buchach, between the Ottoman Empire and the Polish–Lithuanian Commonwealth, is signed. November 24 – Five-year-old Sikandar Adil Shah is enthroned as the last Sultan of Bijapur (located in southwestern India in what is now the Karnataka state) upon the death of his father, the Sultan Ali Adil Shah II. In 1686, the sultanate of Bijapur is conquered and annexed by the Mughal Empire. November 28 – After more than five years of administration of the Treasury of England by a five-member commission, Lord Clifford of Chudleigh, one of the commission members, becomes the Lord High Treasurer of England. December 18 – Hedwig Eleonora of Holstein-Gottorp ends her regency of the Swedish Empire after more than 12 years, having exercised power in the name of her minor son, Charles XI, since the death of her husband Karl X Gustav in 1660. Hedwig Eleonora had served as the chair of the six-member Regency Council. An English invasion force captures the Caribbean island of Tobago from Dutch colonists and destroys the settlement. December 23 – French astronomer Giovanni Domenico Cassini discovers Rhea, a previously-unknown satellite of the planet Saturn. Rhea is the second-largest overall, and the third moon of Saturn to be discovered by Earth astronomers, Titan having been found by Christiaan Huygens on March 25, 1655 and Iapetus by Cassini on October 25, 1671. December 30 – Troops of the Dutch Republic, under the command of Carl von Rabenhaupt, are able to reclaim lost territory for the first time in the Third Anglo-Dutch War, liberating Coevorden, which had been forced to surrender to France on July 1. The moment, a boost for morale in what is remembered in Dutch history as the Rampjaar (the "Disaster Year"), is later memorialized in a painting by Pieter Wouwerman, The Storming of Coevorden. Undated Richard Hoare becomes a partner in the London goldsmith's business which, as private banking house C. Hoare & Co., will survive through to