The Battle of Tsushima (Russian: Цусимское сражение, Tsusimskoye srazheniye), also known as the Battle of Tsushima Strait and the Naval Battle of the Sea of Japan (Japanese: 日本海海戦, Nihonkai-Kaisen) in Japan, was a major naval battle fought between Russia and Japan during the Russo-Japanese War. It was naval history’s first decisive sea battle fought by modern steel battleship fleets, and the first naval battle in which wireless telegraphy (radio) played a critically important role. It has been characterized as the “dying echo of the old era – for the last time in the history of naval warfare, ships of the line of a beaten fleet surrendered on the high seas”.

https://en.m.wikipedia.org/wiki/Battle_of_Tsushima

The Treaty of Portsmouth formally ended the 1904–05 Russo-Japanese War. It was signed on September 5, 1905 after negotiations lasting from August 6 to August 30, at the Portsmouth Naval Shipyard in Kittery, Maine, United States. U.S. President Theodore Roosevelt was instrumental in the negotiations and won the Nobel Peace Prize for his efforts.

https://en.m.wikipedia.org/wiki/Treaty_of_Portsmouth

Babi Yar (Ukrainian: Бабин Яр, Babyn Yar; Russian: Бабий Яр, Babiy Yar) is a ravine in the Ukrainian capital Kyiv and a site of massacres carried out by German forces during their campaign against the Soviet Union in World War II. The first, and best documented, of the massacres took place on 29–30 September 1941, killing approximately 33,771 Jews. The decision to kill all the Jews in Kyiv was made by the military governor Generalmajor Kurt Eberhard, the Police Commander for Army Group South, SS-Obergruppenführer Friedrich Jeckeln, and the Einsatzgruppe C Commander Otto Rasch. Sonderkommando 4a soldiers, along with the aid of the SD and SS Police Battalions with the Ukrainian Auxiliary Police backed by the Wehrmacht carried out the orders. The massacre was the largest mass killing under the auspices of the Nazi regime and its collaborators during its campaign against the Soviet Union and has been called “the largest single massacre in the history of the Holocaust” to that particular date, and surpassed overall only by the later 1941 Odessa massacre of more than 50,000 Jews in October 1941 (committed by German and Romanian troops) and by Aktion Erntefest of November 1943 in occupied Poland with 42,000–43,000 victims.

Victims of other massacres at the site included Soviet prisoners of war, communists, Ukrainian nationalists and Roma. It is estimated that between 100,000 and 150,000 people were killed at Babi Yar during the German occupation.

https://en.m.wikipedia.org/wiki/Babi_Yar

Lucius Cornelius Sulla Felix (/ˈsʌlə/; c. 138 BC – 78 BC), known commonly as Sulla, was a Roman general and statesman and one of the canonical figures of Roman history. He had the distinction of holding the office of consul twice, as well as reviving the dictatorship. Sulla was a skillful general, achieving numerous successes in wars against different opponents, both foreign and Roman. Sulla rose to prominence during the war against the Numidian king Jugurtha, whom he captured through betrayal, although his superior Gaius Marius took credit for ending the war. He then fought successfully against Germanic tribes during the Cimbrian War, and Italic tribes during the Social War. He was even awarded the Grass Crown for his command in the latter war.

Sulla played an important role in the long political struggle between the Optimates and Populares factions at Rome. He was a leader of the former, which sought to maintain the Senatorial supremacy against the social reforms advocated by the latter, headed by Marius. In a dispute over the command of the war against Mithridates, initially awarded to Sulla by the Senate but withdrawn as a result of Marius’s intrigues, Sulla marched on Rome in an unprecedented act and defeated Marius in battle. The Populares nonetheless seized power once he left with his army to Asia. He returned victorious from the East in 82 BC, marched a second time on Rome, and crushed the Populares and their Italian allies at the Battle of the Colline Gate. He then revived the office of dictator, which had been inactive since the Second Punic War over a century before. He used his powers to purge his opponents, and reform Roman constitutional laws, in order to restore the primacy of the Senate and limit the power of the tribunes of the plebs. After a second consulship in 80 BC, he retired to private life and died shortly after.

Sulla’s military coup—ironically enabled by Marius’ military reforms that bound the army’s loyalty with the general rather than to the Republic—permanently destabilized the Roman power structure. Later leaders like Julius Caesar would follow his precedent in attaining political power through force.

https://en.m.wikipedia.org/wiki/Sulla