Mindaugas and his wife Morta were crowned during the summer of 1253.
Bishop Henry Heidenreich of Kulm presided over the ecclesiastical ceremonies and Andreas Stirland conferred the crown.
6 July is now celebrated as Statehood Day (Lithuanian: Valstybės diena); it is an official holiday in modern Lithuania.
The exact date of the coronation is not known; the scholarship of historian Edvardas Gudavičius, who promulgated this precise date, is sometimes challenged.
The location of the coronation also remains unknown.

Relative peace and stability prevailed for about eight years.
Mindaugas used this opportunity to concentrate on the expansion to the east, and to establish and organize state institutions.
He strengthened his influence in Black Ruthenia, in Polatsk, a major center of commerce in the Daugava River basin, and in Pinsk.
He also negotiated a peace with Galicia–Volhynia, and married his daughter to Svarn, the son of Daniel of Galicia, who would later become Grand Duke of Lithuania.
Lithuanian relationships with western Europe and the Holy See were reinforced.
In 1255, Mindaugas received permission from Pope Alexander IV to crown his son as King of Lithuania.
A noble court, an administrative system, and a diplomatic service were initiated.
Silver long coins, an index of statehood, were issued.
He sponsored the construction of a cathedral in Vilnius, possibly on the site of today's Vilnius Cathedral.

Immediately after his coronation, Mindaugas transferred some lands to the Livonian Order – portions of Samogitia, Nadruva, and Dainava—although his control over these western lands was tenuous.
There has been much discussion among historians as to whether in later years (1255–1261) Mindaugas gave even more lands to the order.
The deeds might have been falsified by the order; the case for this scenario is bolstered by the fact that some of the documents mention lands that were not actually under the control of Mindaugas and by various irregularities in treaty witnesses and seals.

Mindaugas and his antagonist Daniel reached a reconciliation in 1255; the Black Ruthenian lands were transferred to Roman, Daniel's son.
Afterwards Mindaugas's son Vaišvilkas received baptism as a member of the Orthodox faith, becoming a monk and later founding a convent and monastery.
Tautvilas's antagonism was temporarily resolved when he recognized Mindaugas's superiority and received Polatsk as a fiefdom.
A direct confrontation with the Mongols occurred in 1258 or 1259, when Berke Khan sent his general Burundai to challenge Lithuanian rule, ordering Daniel and other regional princes to participate.
The Novgorod Chronicle describes the following action as a defeat of the Lithuanians, but it has also been seen as a net gain for Mindaugas.

A single sentence in the Hypatian Chronicle mentions Mindaugas defending himself in Voruta against his nephews and Duke Vykintas; two other sources mention "his castle".
The location of Voruta is not specified, and this has led to considerable speculation, along with archeological research, concerning the seat of his court.
At least fourteen different locations have been proposed, including Kernavė and Vilnius.
The ongoing formal archeological digs at Kernavė began in 1979 after a portion of the site named "Mindaugas Throne hill-fort" collapsed.
The town now hosts a major celebration on Statehood Day.
Mindaugas and his wife Morta were crowned during the summer of 1253. Bishop Henry Heidenreich of Kulm presided over the ecclesiastical ceremonies and Andreas Stirland conferred the crown. 6 July is now celebrated as Statehood Day (Lithuanian: Valstybės diena); it is an official holiday in modern Lithuania. The exact date of the coronation is not known; the scholarship of historian Edvardas Gudavičius, who promulgated this precise date, is sometimes challenged. The location of the coronation also remains unknown.
Relative peace and stability prevailed for about eight years. Mindaugas used this opportunity to concentrate on the expansion to the east, and to establish and organize state institutions. He strengthened his influence in Black Ruthenia, in Polatsk, a major center of commerce in the Daugava River basin, and in Pinsk. He also negotiated a peace with Galicia–Volhynia, and married his daughter to Svarn, the son of Daniel of Galicia, who would later become Grand Duke of Lithuania. Lithuanian relationships with western Europe and the Holy See were reinforced. In 1255, Mindaugas received permission from Pope Alexander IV to crown his son as King of Lithuania. A noble court, an administrative system, and a diplomatic service were initiated. Silver long coins, an index of statehood, were issued. He sponsored the construction of a cathedral in Vilnius, possibly on the site of today's Vilnius Cathedral.
Immediately after his coronation, Mindaugas transferred some lands to the Livonian Order – portions of Samogitia, Nadruva, and Dainava—although his control over these western lands was tenuous. There has been much discussion among historians as to whether in later years (1255–1261) Mindaugas gave even more lands to the order. The deeds might have been falsified by the order; the case for this scenario is bolstered by the fact that some of the documents mention lands that were not actually under the control of Mindaugas and by various irregularities in treaty witnesses and seals.
Mindaugas and his antagonist Daniel reached a reconciliation in 1255; the Black Ruthenian lands were transferred to Roman, Daniel's son. Afterwards Mindaugas's son Vaišvilkas received baptism as a member of the Orthodox faith, becoming a monk and later founding a convent and monastery. Tautvilas's antagonism was temporarily resolved when he recognized Mindaugas's superiority and received Polatsk as a fiefdom. A direct confrontation with the Mongols occurred in 1258 or 1259, when Berke Khan sent his general Burundai to challenge Lithuanian rule, ordering Daniel and other regional princes to participate. The Novgorod Chronicle describes the following action as a defeat of the Lithuanians, but it has also been seen as a net gain for Mindaugas.
A single sentence in the Hypatian Chronicle mentions Mindaugas defending himself in Voruta against his nephews and Duke Vykintas; two other sources mention "his castle". The location of Voruta is not specified, and this has led to considerable speculation, along with archeological research, concerning the seat of his court. At least fourteen different locations have been proposed, including Kernavė and Vilnius. The ongoing formal archeological digs at Kernavė began in 1979 after a portion of the site named "Mindaugas Throne hill-fort" collapsed. The town now hosts a major celebration on Statehood Day.
Mindaugas