Input: Mantua is the ancestral city where the male line of the Gonzaga dynasty ruled, first as marquesses, then after 1540 as dukes, in vassalage to the Holy Roman Empire. Monferrato was a duchy since 1574 on the eastern side of Piedmont, and an Imperial fief since the eleventh or twelfth century. The Gonzagas had enlarged their realm with Monferrato after receiving it in dowry from the wife of duke Frederick II Gonzaga. On 22 September 1612, Francis IV, Duke of Mantua and Monferrato died at the age of 26. His death occurred only a couple of months after the death of his father Vincent I, Duke of Mantua. He left only a three-year-old daughter, Maria of Mantua. Francis IV also had two younger brothers who, both being cardinals, could not marry and were thus ineligible to succeed to Mantua's throne. Nonetheless, Francis' two brothers, Ferdinando I  and Vincenzo II , eventually did become Dukes of Mantua. Despite marrying, following the resignation of Ferdinando and the expulsion of Vincenzo from the Sacred College of Cardinals, neither produced any legitimate children. A crisis erupted when Vincenzo II died on 26 December 1627 at the age of 33, the same day that his niece Maria Gonzaga's marriage with Charles de Nevers was celebrated. Nevers was the eldest son and heir of Charles, Duke of Nevers, Rethel and Mayenne. Moreover, he was the head of the cadet branch of the House of Gonzaga, and after Vincenzo II, heir male of the Duchy of Mantua.

Question: How many years after the male line of the Gonzaga dynasty ruled Mantua as dukes did Monferrato become a duchy?


Input: The Vikings also fought several sea battles among themselves. This was normally done by binding the ships on each side together, thus essentially fighting a land battle on the sea. However the fact that the losing side could not easily escape meant that battles tended to be hard and bloody. The Battle of Svolder is perhaps the most famous of these battles. As Arab power in the Mediterranean began to wane, the Italian trading towns of Genoa, Pisa, and Venice stepped in to seize the opportunity, setting up commercial networks and building navies to protect them. At first the navies fought with the Arabs , but then they found themselves contending with Normans moving into Sicily, and finally with each other. The Genoese and Venetians fought four naval wars, in 1253-1284, 1293-1299,1350-1355, and 1378-1381. The last ended with a decisive Venetian victory, giving it almost a century to enjoy Mediterranean trade domination before other European countries began expanding into the south and west. In the north of Europe, the near-continuous conflict between England and France was characterised by raids on coastal towns and ports along the coastlines and the securing of sea lanes to protect troop-carrying transports. The Battle of Dover in 1217, between a French fleet of 80 ships under Eustace the Monk and an English fleet of 40 under Hubert de Burgh, is notable as the first recorded battle using sailing ship tactics. The battle of Arnemuiden , which resulted in a French victory, marked the opening of the Hundred Years War and was the first battle involving artillery. However the battle of Sluys, fought two years later, saw the destruction of the French fleet in a decisive action which allowed the English effective control of the sea lanes and the strategic initiative for much of the war.

Question: How many years did the first naval war between the Genoese and the Venetians last?


Input: Upon his appointment as Bishop of Wrocław in 1198, Jarosław of Opole, elder son of the Silesian duke Bolesław I the Tall, received the territories around the town of Nysa  from his father. After Jarosław's death in 1201, his half-brother Duke Henry I the Bearded of Silesia decided to leave Nysa, as well as the castellany of Otmuchów, under the control of the Diocese of Wrocław, while the rest of the late Jarosław's Upper Silesian lands were annexed by his uncle Mieszko IV Tanglefoot in the following year. In 1290 Henry IV Probus, duke of Lower Silesia at Wrocław, gave the bishops privileges of autonomy on their lands in Nysa, creating the legal basis for the Duchy of Nysa. Henry of Wierzbna, Bishop of Wrocław from 1302 to 1319, was the first to actually use the title of a Duke of Nysa. The duchy in its original form only lasted until 1335, when Silesia passed to the Kingdom of Bohemia by the Treaty of Trentschin. In 1342 Bishop Przecław of Pogorzeli swore the oath of fealty to King John the Blind and afterwards played a vital role in the negotiations for the 1348 Treaty of Namslau between John's successor Charles IV and King Casimir III the Great of Poland. Pogorzeli also significantly enlarged his territory by acquisition of Grodków  from Duke Bolesław III the Generous of Brzeg in 1344. For the next two hundred years, the Polish, Czech and German inhabitants of Nysa-Grodków lived in relative harmony, even during the beginnings of the Reformation as the control of the region switched between Protestant and Catholic rulers. This ended with the Thirty Years' War.

Question: How many years did the Duchy of Nysa last in its original form?


Input: According to the 2010 United States Census, nearly 3% of people who self-identified as black had recent ancestors who immigrated from another country. Self-reported West Indian American, mostly from Jamaica and Haiti, represented 0.9% of the US population, at 2.6 million. Self-reported black immigrants from Sub-Saharan Africa also represented 0.9%, at about 2.8 million. Additionally, self-identified Black Hispanic and Latino Americans represented 0.4% of the United States population, at about 1.2 million people, largely found within the Puerto Rican and Dominican communities. Self-reported black immigrants hailing from other countries in the Americas, such as Brazil and Canada, as well as several European countries, represented less than 0.1% of the population. Mixed-Race Hispanic and non-Hispanic Americans who identified as being part black, represented 0.9% of the population. Of the 12.6% of United States residents who identified as black, around 10.3% were "native black American" or ethnic African Americans, who are direct descendants of West/Central Africans brought to the U.S. as slaves. These individuals make up well over 80% of all blacks in the country. When including Multiracial American, about 13.5% of the US population self-identified as black or "mixed with black". However, according to the U.S. census bureau, evidence from the 2000 Census indicates that many African and Caribbean immigrant ethnic groups do not identify as "Black, African Am., or Negro". Instead, they wrote in their own respective ethnic groups in the "Some Other Race" write-in entry. As a result, the census bureau devised a new, separate "African American" ethnic group category in 2010 for ethnic African Americans.

Question:
How many more millions of people self-reported black immigrants from Sub-Saharan Africa compared to those self-reported West Indian American?