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The Argonautica: "The Voyage of Argo," aka The Argonautica, by Apollonius of Rhodes (3rd cent. BC) is one of my favorite books from the ancient world. The story of Jason and the Argonauts and their quest for the Golden Fleece is one of the greatest adventure stories ever told and reading its descriptions of battles and monsters and sacrificial rites is like traveling thousands of years back in time. If you're interested in this classic story, I can recommend the Penguin Classics edition (1959,1971), translated by E.V. Rieu, which is particularly clear and easy to follow. The book is full of luminous scenes like this one where the Argonauts, having just landed on the island of Thynia after passing through the Clashing Rocks, see Apollo pass to the north:
"But at that time of day when heavenly light has not yet come, nor is there utter darkness, but the faint glimmer that we call twilight spreads over the night and wakes us, they ran into the harbour of the lonely isle of Thynias and went ashore exhausted by their labours. Here they had a vision of Apollo on his way from Lycia to visit the remote and teeming peoples of the North. The golden locks streamed down his cheeks in clusters as he moved; he had a silver bow in his left hand and a quiver slung on his back; the island quaked beneath his feet and the sea ran high on the shore. They were awe-struck at the sight and no one dared to face the god and meet his lovely eyes. They stood there with bowed heads while he, aloof, passed through the air on his way across the sea." -- The Voyage of Argo, Book II, pp. 89-90.
Another great scene describes the Argonauts conducting an animal sacrifice to Triton, the son of Poseidon and the messenger of the sea:
"They urged Jason to kill the best of their sheep and hold it out to the god with words of praise. Jason hastily selected one, lifted it up and killed it over the stern, praying in these words: 'God of the sea, you that appeared to us on the shore of these waters, whether the Ladies of the Brine [Nereids?] know you as that sea-wonder Triton, or as Phorcys, or as Nereus, be gracious and grant us the happy return that we desire.
"As he prayed he slit the victim's throat and threw it into the water from the stern. Whereupon the god emerged from the depths, no longer in disguise but in his own true form, and grasping the stem of their hollow ship drew her on towards the open sea."
Great stuff. Highly recommended.