1870s – The construction of the sea port was finished and the expansion of Batumi began.
1877–1878 – During the Russo-Turkish War Batumi was defended by a 25,000 Ottoman army under Dervish-Pasha as well as the Ottoman warships cruising off the Black Sea coastline.
August 25: under the guidance of General Pyotr Dmitrievich Sviatopolk-Mirsky Russian army entered Batumi and at the ceremony of reception – accompany on so called "Azizie square" accepted city key from Devrish Pasha.
Following the Treaty of Berlin Batumi was declared a free port (porto franco) and maintained this status until 1886.
1901 – Stalin arrived in Batumi, setting up base in Ali, the Persian tavern.
1902
Batumi City Hall was constructed.
Population: 16,000, with 1,000 of them oil refinery workers.
January 1: Stalin made a speech to 30 party members shouting "We mustn't fear death! The sun is rising. Let's sacrifice our lives!"
January 4: Stalin set the refinery on fire, the workers put it out meaning they are due a bonus which is refused. Stalin got a printing press from Tiflis and called a strike.
February 17: the strikers win a 30% pay increase.
February 26: 389 radical workers are sacked. Stalin calls a second strike.
March: mass strike at the Rothschild oil refinery.
March 7: strike leaders arrested.
March 8: Stalin leads demonstrations outside the police station demanding their release. The prisoners are moved to a transit prison. Governor general Smagin agrees to meet the demonstrators.
March 10: A mob tries to storm the prison but a renegade tips off the Cossacks and troops who fire on them though some prisoners escape. The events culminated in rioting in which the future Soviet leader Joseph Stalin played a role. The clashes with police left 15 dead, 54 wounded, and 500 in prison.
March 12: the dead workers are buried triggering a 7,000 strong demonstration surrounded by Cossacks and gendarmes who ban songs and speeches.
Batumi became an important sea terminal along the Black Sea littoral.
1910 – the Russian authorities decided to dismantle the Mikhailovsky naval fortress at Batumi.
1912–1913 – a gunboat was stationed permanently to keep a check on arms smuggling.
1914 – Although the project to dismantle the Batum fortifications had not been completed by the beginning of World War I.
7 and 10 December: the port still remained vulnerable to the powerful Ottoman-German vessels SMS Breslau and Goeben, which shelled Batum, without much effect.
1915: the Batumi Naval Detachment was established to support the Russian ground operations against Trabzon.
1917: after the February revolution, Evgeny Krinitsky, was nominated as a commissar of Batumi district, who was keeping the stability during this period.
January 12; the British expeditionary forces landed at Batumi to replace the Turkish troops and appointed General James Cooke-Collis as the governor of Batumi. Britain also created the Batumi council under the presidency of the Russian cadet Prilidian Maslov.
14 April 1919: the governor disbanded the council and left the city.
The Committee of the Liberation of Muslim Georgia, led by Memed Abashidze and Haidar Abashidze, had repeatedly spoken of the establishment of autonomy on religious principles within the borders of Georgia.
August 15; the withdrawal of British Troops began from the Caucasus.
September 13; a prototype parliament, the Mejlis, was convened in Batum.
1923 – Shota Rustaveli State University was founded.
1924
August 31: the local cell of the anti-Soviet underground organization was destroyed; its leaders, including major general Giorgi Purtseladze (then the chief of staff of the Batum fortifications), were shot.
1926 – Population: 48,474
1929 – Batumi Maritime Technical University was inaugurated.
1930
March 9: the new membership of the city council presidium were elected, whose chairman became Joseph Giorgadze.
May, Abashidze claimed that Georgian forces were preparing to invade.
May 4; The local oppositional demonstrations.
May 6, Abashidze's position became untenable when local protesters took control over the central Batumi and Georgian Special Forces entered the region and started to disarm pro-Abashidze groups.
Abashidze resigned and departed the country for Moscow.
May 7; direct presidential rule was imposed in Adjara and 20-member Interim Council was set up to run the Autonomous Republic before the local elections could be held in the region.
July 20; Adjarian Supreme Council approved Levan Varshalomidze as the Chairman of the Autonomous Republic's Government.
2010 – May 17: opening ceremony of the hotel "Sheraton Batumi"
2011 – opening ceremony of the hotel “Radisson Blu”
2013 – TAM GEO LLC announced it was investing $70 million to start construction of the 170-meter, 45-story mix-use complex Babillon Tower, which will be the tallest residential building in Georgia.
2014 – Population: 152,839.
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