Born in Ascoli Piceno, the son of the Florentine sculptor Fulgenzio Morelli, who also trained Lazzaro's cousin, the artist Giuseppe Giosafatti. Lazzaro initially came to Rome to work under Francesco Fiammingho (François Duquesnoy), but left that studio to work under Bernini.
He participated in Bernini's Funereal Monument for Pope Alexander VII Chigi, found in St. Peter's Basilica. He also was responsible for the Angel with the scourge, based on a sketch by Bernini; this is one of the angels on the Ponte Sant'Angelo in Rome. He is said to have sculpted the horse and the lion for Bernini's Fountain of the Four Rivers in Piazza Navona. Lazzaro also sculpted the statue of Benignity for the tomb monument of Clement X in St. Peter's. The tomb was designed by Mattia de' Rossi (1684) and the other sculptors who worked on this project were Ercole Ferrata (who sculpted the pope) and Giuseppe Mazzuoli (who sculpted the statue of Clemency). He also completed some of the saints in the roof-line of the external colonnades of Piazza San Pietro.
- *Boni, Filippo de' (1852). Biografia degli artisti ovvero dizionario della vita e delle opere dei pittori, degli scultori, degli intagliatori, dei tipografi e dei musici di ogni nazione che fiorirono da'tempi più remoti sino á nostri giorni. Seconda Edizione.. Venice; Googlebooks: Presso Andrea Santini e Figlio. p. 677.
- Statues of the Colonnade.
- City of Ascoli Piceno website.
- New Attributions in St. Peter's: The Spandrel Figures in the Nave, Robert Enggass. The Art Bulletin, Vol. 60, No. 1 (Mar., 1978), pp. 96–108. doi:10.2307/3049748.
- Cristiano Marchegiani, "Morelli, Lazzaro", in Dizionario biografico degli Italiani, Roma, Istituto della Enciclopedia Italiana, Treccani, vol. LXXVI, 2012, pp. 631–634. 
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