Succession crisis in the context of "War of succession"

The history of Russia begins with the histories of the East Slavs. The traditional start date of specifically Russian history is the establishment of the Rus' state in the north in the year 862, ruled by Varangians. In 882, Prince Oleg of Novgorod seized Kiev, uniting the northern and southern lands of the Eastern Slavs under one authority, moving the governance center to Kiev by the end of the 10th century, and maintaining northern and southern parts with significant autonomy from each other. The state adopted Christianity from the Byzantine Empire in 988, beginning the synthesis of Byzantine, Slavic and Scandinavian cultures that defined Russian culture for the next millennium. Kievan Rus' ultimately disintegrated as a state due to the Mongol invasions in 1237–1240. After the 13th century, Moscow emerged as a significant political and cultural force, driving the unification of Russian territories. By the end of the 15th century, many of the petty principalities around Moscow had been united with the Grand Duchy of Moscow, which took full control of its own sovereignty under Ivan the Great.

Ivan the Terrible transformed the Grand Duchy into the Tsardom of Russia in 1547. However, the death of Ivan's son Feodor I without issue in 1598 created a succession crisis and led Russia into a period of chaos and civil war known as the Time of Troubles, ending with the coronation of Michael Romanov as the first Tsar of the Romanov dynasty in 1613. During the rest of the seventeenth century, Russia completed the exploration and conquest of Siberia, claiming lands as far as the Pacific Ocean by the end of the century. Domestically, Russia faced numerous uprisings of the various ethnic groups under their control, as exemplified by the Cossack leader Stenka Razin, who led a revolt in 1670–1671. In 1721, in the wake of the Great Northern War, Tsar Peter the Great renamed the state as the Russian Empire; he is also noted for establishing St. Petersburg as the new capital of his Empire, and for his introducing Western European culture to Russia. In 1762, Russia came under the control of Catherine the Great, who continued the westernizing policies of Peter the Great, and ushered in the era of the Russian Enlightenment. Catherine's grandson, Alexander I, repulsed an invasion by the French Emperor Napoleon, leading Russia into the status of one of the great powers.

A war of succession is a war prompted by a succession crisis in which two or more individuals claim to be the rightful successor to a deceased or deposed monarch. The rivals are typically supported by factions within the royal court. Foreign powers sometimes intervene, allying themselves with a faction. This may widen the war into one between those powers.

Wars of succession were some of the most prevalent types of wars by cause throughout human history, but the replacement of absolute monarchies by an international order based on democracy with constitutional monarchies or republics ended almost all such wars by 1900.

The Time of Troubles (Russian: Смутное время, romanized: Smutnoye vremya), also known as Smuta (Russian: Смута, lit. 'troubles'), was a period of political crisis in Russia which began in 1598 with the death of Feodor I, the last of the House of Rurik, and ended in 1613 with the accession of Michael I of the House of Romanov at the 1613 Zemsky Sobor.

It was a period of deep social crisis and lawlessness following the death of Feodor I, a weak and possibly intellectually disabled ruler who died without an heir. His death ended the Rurik dynasty, leading to a violent succession crisis with numerous usurpers and false Dmitrys (impostors) claiming the title of tsar. Russia experienced the famine of 1601–1603, which killed almost a third of the population, within three years of Feodor's death. Russia was also occupied by the Polish–Lithuanian Commonwealth during the Polish–Russian War and lost Smolensk.

The House of Romanov (also transliterated as Romanoff. Russian: Романовы, romanized: Romanovy, IPA: [rɐˈmanəvɨ]) was the reigning imperial house of Russia from 1613 to 1917. They achieved prominence after Anastasia Romanovna married Ivan the Terrible, the first crowned tsar of all Russia. Nicholas II, the last Emperor of Russia, and his immediate family were executed in 1918, but there are still living descendants of other members of the imperial house.

The house consisted of boyars in Russia (the highest rank in the Russian nobility at the time) under the reigning Rurik dynasty, which became extinct upon the death of Feodor I in 1598. The Time of Troubles, caused by the resulting succession crisis, saw several pretenders and imposters lay claim to the Russian throne during the Polish-Lithuanian occupation. On 21 February 1613, the Zemsky Sobor elected Michael Romanov as tsar, establishing the Romanovs as Russia's second reigning dynasty.

A succession crisis emerged in Portugal in 1580 as a result of the disappearance of the young King Sebastian in the Battle of Alcácer Quibir in 1578 and the death of his great-uncle King Henry in 1580. As Sebastian and Henry died childless, a dynastic crisis unfolded, marked by internal conflicts and external contenders vying for the Portuguese throne. Ultimately, King Philip II of Spain succeeded, uniting the Portuguese and Spanish Crowns in the Iberian Union. This personal union endured for 60 years, during which the Portuguese Empire faced decline and global challenges, notably the Dutch–Portuguese War.

The Polish–Russian War was a conflict fought between the Polish–Lithuanian Commonwealth and the Tsardom of Russia from 1609 to 1618.

Russia had been experiencing the Time of Troubles since the death of Tsar Feodor I in 1598, which caused political instability and a violent succession crisis upon the extinction of the Rurik dynasty; furthermore, a major famine ravaged the country from 1601 to 1603. Poland exploited Russia's civil wars when powerful members of the Polish szlachta began influencing Russian boyars and supporting successive pretenders to the title of tsar of Russia against the crowned tsars Boris Godunov (r. 1598–1605) and Vasili IV Shuysky (r. 1606–1610). From 1605, Polish nobles conducted a series of skirmishes until the death of False Dmitry I in 1606, and they invaded again in 1607 until Russia formed a military alliance with Sweden two years later. The King of Poland, Sigismund III Vasa, declared war on Russia in response in 1609, aiming to gain territorial concessions and to weaken Sweden's ally. Polish forces won many early victories such as the 1610 Battle of Klushino. In 1610, Polish units entered Moscow and Sweden withdrew from the military alliance with Russia, instead triggering the Ingrian War of 1610-1617 between Sweden and Russia.

Toshiko (Japanese: 智子; 23 September 1740 – 24 December 1813), posthumously honored as Empress Go-Sakuramachi (後桜町天皇, Go-Sakuramachi-tennō) was the 117th monarch of Japan, according to the traditional order of succession. She was named after her father Emperor Sakuramachi, with the word go (後) before her name translating in this context as "later" or "second one". Her reign during the Edo period spanned the years from 1762 through to her abdication in 1771. The only significant event during her reign was an unsuccessful outside plot that intended to displace the shogunate with restored imperial powers. As of 2025, she remains the most recent empress regnant of Japan as the current constitution does not allow women to inherit the throne.

Empress Go-Sakuramachi and her brother Emperor Momozono were the last lineal descendants of Emperor Nakamikado. Her nephew succeeded her as Emperor Go-Momozono upon her abdication in 1771. Go-Momozono died eight years later after a serious illness with no heir to the throne. A possible succession crisis was averted when Go-Momozono hastily adopted an heir on his deathbed upon the insistence of his aunt. In her later years, Go-Sakuramachi became a "guardian" to the adopted heir, Emperor Kōkaku, until her death in 1813. In the history of Japan, Go-Sakuramachi was the last of eight women to take on the role of empress regnant.