Short answers, pulled from the story.
Alexander III earned the title The Peacemaker (Царь-Миротворец) because Russia fought no major wars during his reign from 1881 to 1894. Despite personal hostility toward Germany and tensions with Britain, his Foreign Minister Nikolay Girs consistently steered him away from armed conflict through negotiated settlements and treaties.
The Franco-Russian Alliance was signed in 1892 during Alexander III's reign. It was engineered by Foreign Minister Nikolay Girs and moved Russia out of the German diplomatic orbit into a coalition with France, supported by French financial assistance to Russian modernization. The alliance later expanded into the Triple Entente with Britain and contributed to Russia's involvement in World War I.
Alexander III became tsar on the 13th of March 1881 when his father, Alexander II, was assassinated by members of the revolutionary organization Narodnaya Volya. He had become tsesarevich only in 1865, when his elder brother Nicholas died unexpectedly, making him the heir despite having been educated only as an ordinary Grand Duke. He was officially crowned at the Assumption Cathedral in Moscow on the 27th of May 1883.
The May Laws of 1882 were anti-Jewish restrictions implemented during Alexander III's reign. They banned Jews from inhabiting rural areas and shtetls, even within the Pale of Settlement, and restricted the occupations open to them. The laws encouraged open antisemitic sentiment, triggered dozens of pogroms across the western empire, and drove many Jews to emigrate to Western Europe and the United States.
Konstantin Pobedonostsev was Alexander's tutor and chief political advisor, a former professor of civil law at Moscow State University. He served as chief procurator of the Most Holy Synod of the Orthodox Church from 1880 to 1905, giving him control over the Russian church throughout Alexander's reign. On the day Alexander II was assassinated, Pobedonostsev advised the new tsar to cancel a decree that would have established consultative commissions, and Alexander complied immediately.
Alexander III died of nephritis, a terminal kidney disease, on the 1st of November 1894 at the Maly Palace in Livadia, Crimea. He was 49 years old. The onset of his kidney failure was attributed to blunt trauma he suffered when the imperial train derailed at Borki in 1888, where he reportedly held up the collapsed roof of the dining car while his children escaped. He died in the arms of his wife Maria Feodorovna.