Constantine appointed his mother Helena as Augusta Imperatrix, and gave her unlimited access to the imperial treasury in order to locate the relics of the Christian tradition. In 326-28 AD Helena undertook a trip to Palestine. According to Eusebius of Caesarea (260/265 AD - 339/340 AD), who records the details of her pilgrimage to Palestine and other eastern provinces, she was responsible for the construction or beautification of two churches, the Church of the Nativity, Bethlehem, and the Church of Eleona on the Mount of Olives, sites of Christ's birth and ascension, respectively. Local founding legend attributes to Helena's orders the construction of a church in Egypt to identify the Burning Bush of Sinai. The chapel at Saint Catherine's Monastery—often referred to as the Chapel of Saint Helen—is dated to the year 330 AD.