Ivan's repeated invitations to Ghisolfi seem to indicate that he hoped the latter's services would be valuable to him in extending Russian influence on the [[Black Sea]]. Yet it is strange that during a period of more than eighteen years Ghisolfi did not succeed in reaching Russia. Whether the fact that Ghisolfi was a Jew had anything to do with the impediments put in his way, it is difficult to ascertain, for no mention of him is to be found in Jewish writings. The different spellings of Zachariah's name in [[Italian language|Italian]] and [[Russian language|Russian]] documents—"Guizolfi," "Guigursis," and "Guilgursis"—may be attributed to errors of the Russian scribes.
==19th-century groups==In the early 19th century, a number of communities appeared in [[Tula, Russia|Tula]], [[Voronezh]] and [[Tambov]], which followed Jewish traditions and [[halacha]]. They were also called ''zhidovstvuyuschiye'' and were persecuted severely in the times of [[Nicolas I]]. Since the beginning of the 20th century, they have been also called ''iudeystvuyuschie'', from ''iudeystvo'', a neutral term for the [[Jewish religion]]. Now they are generally considered a part of [[Jewish people]] (although with no real Israelite descent) and some of them have [[Aliyah|immigrated to Israel]]. These groups, however, are not linked to the teaching of Skhariya.