Mena wrote La Coronaçión (or Calamicleos, The Coronation, 1438) and dedicated it to Íñigo López de Mendoza, marqués de Santillana (marquis of Santillana), in response to the latter's 1438 victory on the frontier between Muslim and Christian Spain, which resulted in the taking of Huelma. Although a relatively minor victory, it was the first successful campaign of the Reconquista since 1431. The poem consists of 51 stanzas recounting a dream sequence in which the poet first sees historical and mythological figures being punished for their vices or their failure to act, and later sees those figures who have earned a place on Mount Parnassus for their virtues; principal among those praised is the marqués de Santillana.