The three Polonaises, Op. 71 were composed by Frédéric Chopin in his earlier days, possibly as early as 1820.
After the death of the composer, Julian Fontana had made up their summaries and publications. These works were published in 1855.
Music
Like most of Chopin's polonaises, they are in ternary form.
References
Polonaises, Op. 71 (Chopin) Wikipedia(Text) CC BY-SA