Carl Heinrich Graun, a German composer and Kapellmeister to Frederick the Great, recruited Bottarelli to the Berlin court during his trip to Italy in 1740-1741.
[1] Bottarelli was a witness in a court case against Casanova, who reported of him "Botarelli publishes in a pamphlet all the ceremonies of the Freemasons, and the only sentence passed on him is: 'He is a scoundrel.
[1] After this Bottarelli managed Giovanni Giordani's opera troupe before moving to England in 1754; ultimately becoming the house poet at the King's Theatre, London in the late 1750s.
In the London theatre he was most often employed modifying the texts to pre-existing burlettas; re-working the libretti to already successful works rather than writing completely original material of his own.
However, he did continue to write new libretti in London during his roughly 25 year period at the King's Theatre; doing so for new operas by composers Felice Alessandri, Johann Christian Bach, Gioacchino Cocchi, Pietro Alessandro Guglielmi, Antonio Sacchini, and Mattia Vento.