Your search for "Letters from overseas" returned 3 letters.
Gilbert Talbot writes to his father, George (sixth earl of Shrewsbury), and his stepmother and mother-in-law, Bess (countess of Shrewsbury), reporting that he and his brother-in-law, Henry Cavendish, have arrived safely in Padua. He assures them that since 'we are now well settled in so convenient a place [. . .] we doubt not but to employ the time that we tary here according to your honours' expectation of us'.
Henry Cavendish writes to his mother, Bess (countess of Shrewsbury), and her husband, George, sixth earl of Shrewsbury, from Padua, with a report of he and his brother-in-law Gilbert Talbot's travels in Europe; asking to 'know your honours' pleasures, either for our further travel, abode here, or return'.
Grace Cavendish (née Talbot) writes to her stepmother and mother-in-law, Bess (countess of Shrewsbury), to thank her for forwarding a letter which Henry Cavendish, Grace's husband and Bess's son, wrote during his travels to Constantinople.