The Slav Epic, Slovanská epopej), was painted by the famous Art Nouveau Alphonse Mucha between 1910 and 1928, and is a cycle of 20 large canvases. The cycle shows the mythology and history of the Slavic people.
Mucha died in July 1939. He was interrogated by the Gestapo because he was culturally important in Czechoslovakia. During WWII, the paintings were hidden away to prevent the Nazis from seizing them.
The Slav Epic was on display in Moravský Krumlov for almost 50 years. Prague waged a decade-long legal battle to move the paintings to the city which intensified in early 2010. The city of Prague felt the paintings would be seen by more people...tourists...if they were located in Prague but none of the city's galleries had space for the pieces. They are huge; up to 6 metres tall and 8 metres wide (19.8 feet tall by 26.25 wide).
In 2012 the paintings were moved to the National Gallery and stayed there until the end of 2016. In 2017 they were taken on a two-year tour of Asia before returning to Prague in 2019. The Asian tour was controversial and Mucha's grandson unsuccessfully sued Prague to stop the tour.
The paintings returned to Moravský Krumlov in July 2021 where they are to remain for up to five years. In 2022, Prague signed an agreement to renovate Savarin Palace, in Prague, which is to be the painting's new home. In my humble opinion, Prague being the capital and all, the city has more than enough things to see and do. There weren't any problems with having the paintings in Moravský Krumlov and having the paintings outside of Prague brought tourists to South Moravia.
Seeing The Slav Epic has been on my list of things to do for a long time. Claudia and Nat went and saw it about 12 or so years ago but on a weekend when I was out of town somewhere. It was worth the wait.
Here's a Rick Steves video I found out on YouTube about Alphonse Mucha and The Slav Epic.