Albert Frederick was married in 1573 to Marie Eleonore of Cleves, a daughter of Wilhelm, Duke of Jülich-Cleves-Berg and Archduchess Maria of Austria (1531–1581).
The Hohenzollerns expanded their territory by co-rulership since 1577 and acquiring the Duchy of Prussia in 1618, the Duchy of Cleves (1614) in the Rhineland, and territories in Westphalia.
In 1815 at the Congress of Vienna, Cologne was made part of the Kingdom of Prussia, first in the Jülich-Cleves-Berg province and then the Rhine province.
His inheritance consisted of the Margraviate of Brandenburg, the Duchy of Cleves, the County of Mark, and the Duchy of Prussia.
The king married a fourth time in 1540, to the German Anne of Cleves for a political alliance with her Protestant brother, the Duke of Cleves.
It was still occasionally defended through the mid-19th century, notably by John Cleves Symmes Jr. and Jeremiah N. Reynolds, but by this time it was part of popular pseudoscience and no longer a scientifically viable hypothesis.
In 1818, John Cleves Symmes, Jr. suggested that the Earth consisted of a hollow shell about 1,300 km (810 mi) thick, with openings about 2,300 km (1,400 mi) across at both poles with 4 inner shells each open at the poles.
NEQUA or The Problem of the Ages, first serialized in a newspaper printed in Topeka, Kansas in 1900 and considered an early feminist utopian novel, mentions John Cleves Symmes' theory to explain its setting in a hollow Earth.
Symzonia: A Voyage of Discovery by a "Captain Adam Seaborn" (1820) which reflected the ideas of John Cleves Symmes, Jr.; Edgar Allan Poe's 1838 novel The Narrative of Arthur Gordon Pym of Nantucket;
The number of circles rose to four, so they were called Quartiere (quarters): This division was however not adopted by the Kontore, who, for their purposes (like Ältermänner elections), grouped the league members in different ways (e.g., the division adopted by the Stahlhof in London in 1554 grouped the league members into Dritteln, whereby Lübeck merchants represented the Wendish, Pomeranian Saxon and several Westphalian towns, Cologne merchants represented the Cleves, Mark, Berg and Dutch towns, while Danzig merchants represented the Prussian and Livonian towns).
Having considered the matter, Cromwell suggested Anne, the 25-year-old sister of the Duke of Cleves, who was seen as an important ally in case of a Roman Catholic attack on England, for the duke fell between Lutheranism and Catholicism.
Hans Holbein the Younger was dispatched to Cleves to paint a portrait of Anne for the king.
Joachim Frederick's second marriage, on 23 October 1603, was to Eleanor of Prussia, born 12 August 1583, daughter of Albert Frederick and Marie Eleonore of Cleves.
John Sigismund gave the Reichshof Castrop to his teacher and educator Carl Friedrich von Bordelius, whereas he received the territories of Cleves, Mark, and Ravensberg in the Treaty of Xanten in 1614.
From 1609 onward, they had a territorial base in the vicinity, the Duchy of Cleves, the starting-point of the future Prussian Rhineland.
Over 1539, the king's chief minister, Thomas Cromwell, negotiated a potential alliance with the Duchy of Cleves.
Suggestions that Mary marry the Duke of Cleves, who was the same age, came to nothing, but a match between Henry and the Duke's sister Anne was agreed.
Between Emmerich and Cleves the Emmerich Rhine Bridge, the longest suspension bridge in Germany, crosses the 400-metre-wide (1,300 ft) river.
As for Cromwell, he was delighted that his plan of a royal marriage between Henry and Anne of Cleves, the sister of a German prince was accepted by the king.
Henry's marriage to Anne of Cleves was quickly annulled on 9 July by the vice-gerential synod, now led by Cranmer and Gardiner.