Brandenburg Concerto No. 5 "Brandenburg Concertos" takes a central place. Nonetheless around half a dozen of Bach's extant concertos, including some of the "Brandenburg Concertos" and lost models of his later harpsichord concertos, seem to have had their roots in his Weimar period. Most of what Bach may have left with his employer in Weimar perished in a fire destroying Schloss Weimar in the 1770s. In 1719 a new large two-manual harpsichord arrived in the residence of Bach's then-time employer at Köthen. BWV 1050a, an extant early version of the fifth "Brandenburg Concerto", may have been conceived for this instrument, but that seems unlikely
Brandenburg-Schwedt Brandenburg-Schwedt Brandenburg-Schwedt was a secundogeniture of the Hohenzollern margraves of Brandenburg, established by Prince Philip William who took his residence at Schwedt Castle in 1689. By appanage, they administered the manors of Schwedt and Vierraden on the Oder river (Uckermark and Neumark) as well as Wildenbruch in Pomerania (present-day Swobnica, Poland). Though prosperous, the cadet branch never obtained Imperial immediacy. Because of a lack of money in the late days of the disastrous Thirty Years' War (1618–1648), the "Great Elector Frederick William of Brandenburg in about 1640 mortgaged the Schwedt region to the Baltic German noble Gustav Adolf von (Varrensback,