Short answers, pulled from the story.
Andrei Rublev was a Russian painter born around 1360, considered one of the greatest medieval Russian artists of Orthodox Christian icons and frescoes. He is revered as a saint in the Eastern Orthodox Church, and his work came to be seen as the ideal of Eastern Church painting and Orthodox iconography.
The icon of the Trinity, created around 1410, is the only work authenticated as entirely Rublev's. He based it on an earlier icon type called the Hospitality of Abraham but removed the figures of Abraham and Sarah, shifting the focus to the Mystery of the Trinity through composition and symbolism.
The Russian Orthodox Church canonized Rublev as a saint in 1988. His feast days are observed on the 29th of January and the 4th of July.
Rublev likely lived at the Trinity Lavra of St. Sergius near Moscow early in his career. He later worked at the Cathedral of the Annunciation in the Moscow Kremlin, the Dormition Cathedral in Vladimir, and finally at the Andronikov Monastery in Moscow, where he died between 1427 and 1430.
On the 22nd of June 2024, the Trinity icon was returned to the Holy Trinity Lavra of St. Sergius and installed in its original position on the iconostasis of Holy Trinity Cathedral.
In 1966 the Soviet filmmaker Andrei Tarkovsky released a film titled Andrei Rublev, loosely based on the artist's life. It was the first Soviet-era film to treat Rublev as a world-historic figure and to present Christianity as central to Russia's historical identity.