Simon is known as the “zealot” or “Cananean” (which translates from Aramaic to zealot). Jude is “Judas” in the Greek, but he is distinguished from Judas the betrayer. There are ancient traditions that link Simon and Jude together as missionaries to Persia, and it is their they are martyred. It may explain why there is not much written about them.
Read more at the Mission of St. Clare biography by James Kiefer
Scriptures for the Day:
O God, we thank you for the glorious company of the apostles, and especially on this day for Simon and Jude; and we pray that, as they were faithful and zealous in their mission, so we may with ardent devotion make known the love and mercy of our Lord and Savior Jesus Christ; who lives and reigns with you and the Holy Spirit, one God, for ever and ever. Amen.