Hey Sofia, you asked for it!
Manuel Alonso Mart�nez was actually born in Burgos in 1827 and was lawyer ---> judge ---> politician while at the same time being a philosopher and academic. He had great influence during the reign of many a king/queen from Isabel II to Alfonso XII and was a huge supporter of the Spanish Monarchy during the first republic. He founded many political parties and was even president of the Northern Railway System.
His biggest influence on Madrid was during his stint as Civil Governer of the city.
Also a poet and actor (man, I think he was even bussier than I am) he earned a place in the history of Spain and was seen as a truly great man.
Anyway... some links for you:
www.ubu.es/servicios/aualmart/historia_y_vida.html - a complete life's story!
www.xtec.es/~jrovira6/bio/alonso.htm - a brief biography.
Both pages are in Spanish.
So, as far as the actual neighborhood, a great place and the Plaza de Santa B�rbara is one of my favortite squares in Madrid and without a doubt one of the greenest.
Saludos,
jer...