score:7
Writing out the question somehow jogged my memory and I found him: Francisco de Miranda.
From Wikipedia:
"Miranda led a romantic and adventurous life in the general political and intellectual climate that emerged from the Age of Enlightenment that influenced all of the Atlantic Revolutions. He participated in three major historical and political movements of his time: the American Revolutionary War, the French Revolution and the Spanish American wars of independence. He described his experiences over this time in his journal, which reached to 63 bound volumes."
Here's the biography in question-- "Francisco de Miranda: A Transatlantic Life in the Age of Revolution."
And Spanish speakers can find digitized versions of his journal free (legal) here.