In the latter part of the 19th century, Jewish schools in what are now Greece and Turkey began using simple textbooks to teach pupils to read and write in Ladino, an approach that differed both from the traditional method of teaching only Hebrew (on the assumption that children would learn Ladino, written in Hebrew characters, on their own) and the more modern emphasis on learning French, the language of European culture. Sarah Zaides explains the surprising origin of these textbooks:
Beginning in the 1820s, Protestant groups from Britain and the United States influenced by millenarian beliefs anticipated that the upcoming 20th century would usher in the End of Days—a cataclysmic period in which Jews would play an important role. According to Christian sources, . . . Jews would eventually recognize the error of their ways, follow Jesus, and return to the land of Israel to usher in the Second Coming.
To promote this belief, Protestant missions established schools in the various cities of the Ottoman empire. They also seem to have published the first silabarios [as these textbooks were known]. The first one, published in 1855, contained four short chapters, including a chapter on Rashi script [the style of Hebrew writing and printing normally used for Ladino] and reading-comprehension passages. Due to the visibly Christian themes in these passages, the historian Rachel Saba Wolfe has suggested that missionaries composed and published them in the hope of attracting Jews to Christianity by making the tenets of the faith available to Jews in their own language. During the 19th century, missionaries in the Ottoman empire also published Ladino translations of the Hebrew Bible and of the New Testament, as well as biblical concordances and even a newspaper, with the same goals in mind.
In response to the appearance of these missionary texts, Sephardi Jews decided to publish their own books in Ladino that would promote Jewish messages to the Jewish masses and counter the missionary propaganda. The silabarios [they composed] replicated aspects of the structure of the Protestant books, but, importantly, changed the content of the reading-comprehension passages to reflect Jewish rather than Christian perspectives.
Read more on Stroum Center for Jewish Studies: http://jewishstudies.washington.edu/sephardic-studies/learning-ladino-ottoman-empire/