 If you liked
Romeo no Aoi Sora
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 ...then you might like
Vinland Saga Season 2
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Both MC is sold into slavery and then finds themselves under a kind master. They both make a new friend and form a strong brotherly bond. Romeo and Thorifnn both grow as a strong character and learn about the many complexities in life. Both story is set in Europe with excellent slice of life elements, drama, and a sense of adventure.
While Vinland is more set in the Danish countryside around 11th century, Romeo no Aoi Sora is set in 19th century Italy.