In Thee Rejoiceth also known as Epi Si Harri is a tempera and gold leaf painting by Georgios Klontzas.

The In Thee Rejoiceth painting was copied by countless Greek and Italian painters.

Theodore Poulakis created a version in the 17 century that is very similar to Klontzas's In Thee Rejoiceth.

The Klontzas painting is currently at the Hellenic Institute of Byzantine and Post-Byzantine Studies Museum in Venice.

[1][2][3][4] Klontzas was inspired by the hymn that was composed by the Syrian monk John of Damascus.

The hymn is as follows: Ἐπὶ σοὶ χαίρει, Κεχαριτωμένη, πᾶσα ἡ κτίσις, Ἀγγέλων τὸ σύστημα, καὶ ἀνθρώπων τὸ γένος, ἡγιασμένε ναέ, καὶ Παράδεισε λογικέ, παρθενικὸν καύχημα· ἐξ ἧς Θεὸς ἐσαρκώθη, καὶ παιδίον γέγονεν, ὁ πρὸ αἰώνων ὑπάρχων Θεὸς ἡμῶν.

All of Creation rejoices in thee, O full of grace the angels in heaven and the race of men, O sanctified temple and spiritual paradise, the glory of virgins, of whom God was incarnate and became a child, our God before the ages.

The painting exhibits elaborate buildings giving viewers a perspective of 16th-century architecture.

At the bottom, is a lagoon reminiscent of Venice, Upper Jerusalem is depicted, as well as saints, who are lined up in dense hierarchical groups.

The Greek Inscription reads ΕΠΙ CΟΙ ΧΑΙΡΕΙ ΚΕΧΑΡΙΤΩΜΕΝΗ ΠΑCΑ Η KTICIC, ΑΓΓΕΛΩΝ ΤΟ CΥCTHMA KAI ANΘΡΩΠΩΝ ΤΟ ΓΕΝΟC (Happy and Blessed is Creation, Angles, the Universe and the Genesis of Man.. His signature was ΣΠΟΥΔΙ Κ[ΑΙ] ΚΟΠΟΣ, ΤΟΥ ΓΕΩΡΓΙΟΥ ΚΛΟΤΖΑ (Tireless Labor and Study of Georgios Klontzas)[7]