The Syriac Sinaiticus, a late 4th century codex also known also as the Sinaitic Palimpsest or the Codex Syriacus, contains a translation of the four canonical gospels of the New Testament into Syriac. It is the oldest translation of the Bible into any language. In 778 CE it was palimpsested with a vita (biography) of female saints and martyrs. The Syriac Sinaiticus is the oldest copy of the gospels in Syriac, and one of two surviving manuscripts (the other being the Curetonian Gospels) that are conventionally dated to before the Peshitta, the standard Syriac translation of the Bible.
The codex was discovered in the library of Saint Catherine's Monastery on Mount Sinai in February 1892 by Semitic scholar Agnes Smith Lewis, who visited the monastery with her identical-twin sister and Semitic scholar Margaret Dunlop Gibson. The following year the sisters returned with a team of scholars that included J. Rendel Harris, to photograph and transcribe the work in its entirety. The manuscript immediately became a central document in tracing the history of the New Testament, both because of its extremely early date, and as evidence for how Greek New Testament manuscripts were understood by Aramaic speaking communities during that period.
In 1894 Agnes Smith Lewis published Catalogue of the Syriac mss. in the Convent of S. Catharine on Mount Sinai. She described the Syriac Sinaiticus as no. 30 in the catalogue on p. 43, and illustrated a page opening. In 1896 Lewis also published Some Pages of the Four Gospels Retranscribed from the Sinaitic Palimpsest with a Translation of the Whole Text.