At intervals from 1793 to 1801 Lang was closely connected with the Prussian statesman Hardenberg, who employed him as his private secretary and archivist, and in 1 797 he was present with Hardenberg at the congress of Rastadt as secretary to the legation.
By the institution of the special mission of Lord Ashburton, however, the direct negotiations between the two governments were, about the time of Everett's arrival in London, transferred to Washington, though much business was transacted at the American legation in London.
He succeeded, however, in obtaining priest's orders at Rome in 1832, and returned to Ireland, but subsequently went to London, officiating for some time in the chapel of the Bavarian Legation.
To these may be added a series of short essays, entitled Discorsi politici, composed during Guicciardini's Spanish legation.
After the battle of Placilla it was clear to President Balmaceda that he could no longer hope to find a sufficient strength amongst his adherents to maintain himself in power, and in view of the rapid approach of the rebel army he abandoned his official duties to seek an asylum in the Argentine legation.