Interesting chapter about Rav Shlomo Ephraim in Lilith's Cave: Jewish Tales of the Supernatural by Howard Schwartz

Shlomo Ephraim Luntschitz

Shlomo Ephraim ben Aaron Luntschitz (1550 – 21 April, 1619) was a rabbi, poet and Torah commentator, best known for his Torah commentary Keli Yakar. He served as the Rabbi of Prague from 1604 - 1619.

Luntschitz is best remembered for his homiletical work, most prominently Keli Yakar ("precious vessel", an allusion toProverbs 20:15) on the Torah which first appeared in Lublin in 1602, is still printed in many editions of the Pentateuch and continues to be highly popular.

He composed two penitential prayers in commemoration of the 1611 pogroms that hit Prague on the 2nd of Adar on the Jewish calendar.

In addition he wrote:

Ir Giborim ("city of strong men", cf. Proberbs 21:22), comprising Petichot u-Shearim ("openings and gates") and two works of Torah homilies. It was first published in Basel in 1580.
Olelot Ephraim ("grapes of Ephraim", a reference to Judges 8:2), four volumes of sermons published in Lublin 1590.
Amudei Shesh ("pillars of marble", Esther 1:6), sermons (Prague, 1617)
Siftei Da'at ("words of wisdom", also Proverbs 20:15), a continuation of Keli Yakar in style and reach, Prague 1610.
Orach le-Chayim ("a path for life", Proberbs 10:17), sermons for Shabbat Shuvah and Shabbat ha-Gadol, Lublin 1595.
Rivevot Efraim ("myriads of Ephraim", Deuteronomy 33:17), not extant but mentioned in the introduction of Orach le-Chayim.