Thursday’s Tale: Sila Tsarevich and Ivashka with the White Smock
"Sila Tsarevich and Ivashka with the White Smock" comes from Russia, as you can probably tell from the title. The version I read was from Robert Steele in The Russian Garland of Fairy Tales: Being Russian Folk Legends Translated from a Collection of Chapbooks Made in Moscow in 1916. It's a type of helper story, in this case categorized as "The Grateful Dead."
There was once a tsar, named Chotei, who had three sons -- the first, Aspar Tsarevich; the second, Adam Tsarevich; and the third and youngest son, Sila Tsarevich. All three got their father's permission to travel and see the world. the three set sail, each on his own ship. When they were out on the open sea, the eldest brother's ship sailed first, the second brother's next, and Sila Tsarevich sailed last.
On the third day of the voyage they saw a coffin with iron bands floating on the waves. The two oldest brothers sailed past without paying any attention...