Question: Marcin Kromer, was Prince-Bishop of Warmia (Ermland), a Polish cartographer, diplomat and historian in the Kingdom of Poland and later in the Polish-Lithuanian Commonwealth, he was a personal secretary to two Kings of Poland, Sigismund II Augustus and Sigismund I of Poland, of the Jagiellon dynasty, reigned as King of Poland and also as the Grand Duke of Lithuania, during which time span?

Context articles: Jan Zamoyski
Sigismund II Augustus
Barbara Radziwiłł
Sigismund I the Old
Treaty of Vilnius (1559)
Marcin Kromer
Treaty of Vilnius (1561)
Prince-Bishopric of Warmia
Anna Jagiellon
Catherine of Austria, Queen of Poland

Jan Zamoyski or Zamojski (Latin: "Ioannes de Zamość" ; 1542–1605) was a Polish nobleman, magnate, and the 1st "ordynat" of Zamość.
 Royal Secretary from 1566, Deputy Kanclerz (Chancellor) of the Crown from 1576, Lord Grand-Chancellor of the Crown from 1578, and Grand Hetman of the Crown from 1581.
 General Starost of Kraków from 1580 to 1585, Starost of Bełz, Międzyrzecz, Krzeszów, Knyszyn and Tartu.
 Important advisor to Kings Sigismund II Augustus and Stephen Báthory, he was one of the major opponents of Bathory's successor, Sigismund III Vasa, and one of the most skilled diplomats, politicians and statesmen of his time, standing as a major figure in the politics of the Polish-Lithuanian Commonwealth throughout his life.
Sigismund II Augustus (Polish: "Zygmunt II August" , Ruthenian: "Żygimont II Awgust", Lithuanian: "Žygimantas II Augustas" , German: "Sigismund II.
 August" ) (1 August 1520 – 7 July 1572) was the King of Poland and Grand Duke of Lithuania, the only son of Sigismund I the Old, whom Sigismund II succeeded in 1548.
 Married three times, the last of the Jagiellons remained childless, and through the Union of Lublin introduced a free elective monarchy.
Barbara Radziwiłł (Polish: "Barbara Radziwiłłówna" , Lithuanian: "Barbora Radvilaitė" ; 6 December 1520/23 – 8 May 1551) was Queen of Poland and Grand Duchess of Lithuania as consort of Sigismund II Augustus, the last male monarch of the Jagiellon dynasty.
 Barbara, a great beauty and already widowed, became a royal mistress most likely in 1543 and they married in secret in July or August 1547.
 The marriage caused a scandal; it was vehemently opposed by Polish nobles, including Queen mother Bona Sforza.
 Sigismund Augustus, assisted by Barbara's cousin Mikołaj "the Black" Radziwiłł and brother Mikołaj "the Red" Radziwiłł, worked tirelessly to gain recognition of their marriage and to crown Barbara as Queen of Poland.
 They succeeded and Barbara's coronation was held on 7 December 1550 at Wawel Cathedral.
 However, her health was already failing and she died just five months later.
 Even though it was brief, her reign propelled the Radziwiłł family to new heights of political power and influence.
Sigismund I of Poland (Polish: "Zygmunt I Stary" , Lithuanian: "Žygimantas I Senasis" ; 1 January 1467 – 1 April 1548), of the Jagiellon dynasty, reigned as King of Poland and also as the Grand Duke of Lithuania from 1506 until 1548.
 Earlier, Sigismund had been invested as Duke of Silesia.
 A successful monarch and a great patron of arts, he established Polish suzerainty over Ducal Prussia (East Prussia) and incorporated the duchy of Mazovia into the Polish state, securing the nation's wealth, culture and power.
The Treaty of Vilnius or Vilna was concluded on 31 August 1559, during the Livonian War, between the Livonian Order and the Polish-Lithuanian Commonwealth at Vilnius (Vilna, Wilna, Wilno).
 Gotthard von Kettler put the lands of the order under protection of Polish king and Grand Duke of Lithuania, Sigismund II Augustus.
 The alliance was intended to neutralize the imminent threat of annexation of the order's lands by Russia, yet despite earning military support from Polish-Lithuanian chancellor Mikołaj "the Black" Radziwiłł, Kettler was unable to prevent the occupation of most of Livonia by Russian forces.
 Thus, Kettler concluded a second treaty with Poland-Lithuania on 28 November 1561, transferring the remnants of the Teutonic Order State to the Polish Crown and the Grand Duchy of Lithuania, himself becoming a vassal of Sigismund II Augustus.
Marcin Kromer (Latin: "Martinus Cromerus"; 11 November 1512 – 23 March 1589) was Prince-Bishop of Warmia (Ermland), a Polish cartographer, diplomat and historian in the Kingdom of Poland and later in the Polish-Lithuanian Commonwealth.
 He was a personal secretary to two Kings of Poland, Sigismund I the Old and Sigismund II Augustus.
The Treaty of Vilnius or Vilna was concluded on 28 November 1561, during the Livonian War, between the Livonian Confederation and the Polish-Lithuanian Commonwealth at Vilnius (Vilna, Wilna, Wilno).
 With the treaty, the non-Danish and non-Swedish part of Livonia, with the exception of the Free imperial city of Riga, subjected itself to Polish king and Grand Duke of Lithuania, Sigismund II Augustus with the Pacta subiectionis (Provisio ducalis).
 In turn, Sigismund granted protection from the Tsardom of Russia and confirmed the Livonian estates' traditional privileges, laid out in the Privilegium Sigismundi Augusti.
The Prince-Bishopric of Warmia (Polish: "Biskupie Księstwo Warmińskie" , German: "Fürstbistum Ermland" ) was a semi-independent ecclesiastical state, ruled by the incumbent ordinary of the Ermland/Warmia see and comprising one third of the then diocesan area.
 The other two thirds of the diocese were under the secular rule of Monastic state of the Teutonic Knights (Teutonic Prussia) (till 1525, and Ducal Prussia thereafter).
 The Ermland/Warmia see was a Prussian diocese under the jurisdiction of the Archbishopric of Riga that was a protectorate of Teutonic Prussia (1243–1466) and a protectorate by treaty of Poland - later part of the Polish-Lithuanian Commonwealth after the Peace of Thorn (1466–1772)
Anna Jagiellon (Polish: "Anna Jagiellonka" , Lithuanian: "Ona Jogailaitė" ; 18 October 1523 – 12 November 1596) was Queen of Poland and Grand Duchess of Lithuania in her own right from 1575 to 1586.
 She was a daughter of Polish King Sigismund I the Old and his Italian wife Bona Sforza.
 Despite multiple proposals, she remained unmarried until the age of 52.
 After the death of King Sigismund II Augustus, her brother and the last male member of the Jagiellon dynasty, Anna's hand was sought by pretenders to the Polish–Lithuanian throne to maintain the dynastic tradition.
 She was elected, along with her then-fiancé Stephen Báthory, as co-ruler in the 1576 royal election of the Polish–Lithuanian Commonwealth.
 Their marriage was a formal arrangement and distant.
 Báthory was preoccupied with the Livonian War, while Anna spent her time in Warsaw on local administrative matters and several construction works.
 After Báthory's death in December 1586, she had an opportunity to claim the throne for herself (she was co-ruler and not merely a consort), but did not even attempt it.
 Instead, she promoted her nephew Sigismund III Vasa, establishing House of Vasa on the Polish–Lithuanian throne for the next eighty years (1587–1668).
Catherine of Austria (Polish: "Katarzyna Habsburżanka" ; Lithuanian: "Kotryna Habsburgaitė" ; 15 September 1533 – 28 February 1572) was one of the fifteen children of Ferdinand I, Holy Roman Emperor and Anna of Bohemia and Hungary.
 In 1553, she married Polish King Sigismund II Augustus and became Queen consort of Poland and Grand Duchess consort of Lithuania.
 Their marriage was not happy and they had no issue.
 After a likely miscarriage in 1554 and a bout of illness in 1558, Sigismund became increasingly distant.
 He tried but failed to obtain a divorce from the pope.
 In 1565, Catherine returned to Austria and lived in Linz until her death.
 Sigismund died just a few months after her bringing the Jagiellon dynasty to its end.