Short answers, pulled from the story.
Fyodor Tyutchev was a Russian poet and diplomat who lived from 1803 to 1873. He wrote roughly 400 short poems, many of which became among the most memorized and quoted verses in the Russian language. Though largely overlooked during his lifetime, he was later recognized by the Russian Symbolists as a major poet.
The Denisyeva Cycle is a body of lyric poems Tyutchev wrote during his affair with Elena Denisyeva, who was more than twenty years his junior and remained his mistress from 1850 until her death from tuberculosis in 1864. Critics have described the cycle as "a novel in verse" and "a human document, shattering in the force of its emotion," with Last Love cited as its most emblematic poem.
Tyutchev's first collected volume of verse was published in 1854. It was prepared by Ivan Turgenev and others without any assistance from Tyutchev himself, who regarded his poems as bagatelles not worthy of publication.
Silentium! was written in 1830 and is considered an archetypal Tyutchev poem. Its rhythm was crafted to make reading in silence easier than reading aloud, and its imagery is anthropomorphic and charged with pantheism. The poem counsels concealing one's inner world, with the refrain "speak no word," and was translated into English by Vladimir Nabokov.
Rachmaninov set Spring Waters, and Nikolai Medtner's Night Wind piano sonata of 1911 was inspired by a Tyutchev poem. Other composers include Georgi Catoire, Boris Tchaikovsky (whose 1974 cantata Signs of the Zodiac includes a setting of Silentium!), Lyubov Streicher, Valentina Ramm, Valentyn Sylvestrov, and Julian Cochran.
Tyutchev lived abroad for 22 years after joining the Russian legation in Munich in 1822 as a trainee diplomat. He was eventually dismissed from the Foreign Service after abandoning his post as chargé d'affaires in Turin without official permission in order to marry Ernestine von Dörnberg in Switzerland. He did not return to St. Petersburg until 1844.