Giovanni was servant to Richard Chandos during his time in Italy (1818-19). He returned to England with Chandos but by September 1821, he was discontented. 

I have arranged every thing respecting Giovanni who goes with his Wife & Child immediately; I pay her passage back, & give him a month’s wages in advance. I think it is by far the best plan, as he has been so discontented that he never could have remained; I mean to see that he gives up all the things previous to his departure. (HEH STG Correspondence Box 52 (03); 19 September 1821)

However, the petulant Giovanni refused the payments offered by Chandos for his return:

Giovanni has refused 20 guineas which I offered to give his Wife for her passage back & will probably now have nothing as I shall not give a halfpenny more; this has always been the case with the cursed Italians. (HEH STG Correspondence Box 52 (03); 30 September 1821)

The situation had not been resolved a week later, despite Chandos doubling his offer:

Giovanni, as I thought has grumble & refused to take the 40 guineas for the payment of his Wife’s passage back & I now think it will probably end in my giving him nothing. I am sorry for this, as it only proves how ungrateful people are. (HEH STG Correspondence Box 52 (03); 4 September 1821)

However, Giovanni did return and in 1828, he joined the Duke's voyage in the Anna Eliza, acting as servant and courier. Richard Temple was, however, far from satisfied: 

My Servant Giovanni in no respects answers my expectations. He never fights any bother for me, but at once delivers me up to be plundered by every fellow who chuses to attempt it. The consequence is that I might just as well be without a Courier. He thinks it no part of his duty to attempt to beat down prices, and merely desires to have “l’ultimo prozizzo” whereupon the rascal whoever he may be asks his dearest price with which Giovanni is contented, and comes to me to explain that nothing ever was so cheap. My Son whose Servant he formerly was must either have been abominably cheated or Giovanni must have been much changed since he served him. (HEH ST 98 Vol 4; 15 September 1828).

In July 1835, Giovanni was back in London and again Chandos's servant (HEH STG Correspondence Box 376 (34); 6 July 1835).