Reap what you Sow was a virtual representation of one of Ezio Auditore da Firenze's genetic memories, relived by Desmond Miles in 2012 through the Animus.
Ezio Auditore received a contract from Lorenzo de' Medici to assassinate one of the benefactors of the Pazzi family, residing on a farm due East of San Gimignano.
Ezio assassinated the target, completing the contract.