Herodotus 2.44
I took ship for Tyre in Phoenicia, where I had learned by inquiry that there was a holy temple of Heracles.
There I saw it, richly equipped with many other offerings, besides two pillars (στῆλαι δύο), one of refined gold, one of emerald.
two worships of Heracles, sacrificing to one Heracles as to an immortal, and calling him the Olympian, but to the other bringing offerings as to a dead hero
I took ship for Tyre in Phoenicia, where I had learned by inquiry that there was a holy temple of Heracles.
There I saw it, richly equipped with many other offerings, besides two pillars (στῆλαι δύο), one of refined gold, one of emerald.
two worships of Heracles, sacrificing to one Heracles as to an immortal, and calling him the Olympian, but to the other bringing offerings as to a dead hero
The prominent feature of this Tyrian Hercules temple are the two pillars, that are called στῆλαι, the word also used forΣτῆλαι Ἡρακλήϊαι "Pillars of Hercules".
In Strabo 5 there is disagreement regarding the nature and location of the pillars of Hercules, they are either geographical features or the physical two bronze pillars in the temple of Heracles in Gadeira.
Strabo 3.5.5
For nothing else resembles pillars around the strait. But those eight-cubit bronze pillars in the temple of Heracles in Gadeira
οὐδὲν γὰρ ἐοικέναι στήλαις τὰ περὶ τὸν πορθμόν. οἱ δὲ τὰς ἐν τῷ Ἡρακλείῳ τῷ ἐν Γαδείροις χαλκᾶς ὀκταπήχεις
For nothing else resembles pillars around the strait. But those eight-cubit bronze pillars in the temple of Heracles in Gadeira
οὐδὲν γὰρ ἐοικέναι στήλαις τὰ περὶ τὸν πορθμόν. οἱ δὲ τὰς ἐν τῷ Ἡρακλείῳ τῷ ἐν Γαδείροις χαλκᾶς ὀκταπήχεις
Temple_of_Hercules_Gaditanus (wiki)
The sanctuary was likely a complex of buildings where the main structure could be accessed through a gateway flanked by two large columns. As described by Silius Italicus in the 1st century BC
According to the Latin historian Pomponius Mela, the temple housed the remains of Hercules, contributing to its immense fame. Moreover, the temple held renowned relics such as the belt of Teucer, a Greek hero and son of Telamon, and the tree of Pygmalion, whose fruits were said to be emeralds.
The sanctuary was likely a complex of buildings where the main structure could be accessed through a gateway flanked by two large columns. As described by Silius Italicus in the 1st century BC
According to the Latin historian Pomponius Mela, the temple housed the remains of Hercules, contributing to its immense fame. Moreover, the temple held renowned relics such as the belt of Teucer, a Greek hero and son of Telamon, and the tree of Pygmalion, whose fruits were said to be emeralds.
Here it mentions the remains of Hercules which means this is Hercules the hero, which also aligns with Homer Odyssey 11.601 in which Odysseus met the phantom of Hercules beyond the gates of Hades (Πύλαι Ἀΐδαο) compare with Πύλαι Γαδειρίδες "Gates of Gadeira" (another name for pillars of Hercules).
Πύλαι Ἀΐδαο "gates of Hades" appear in Isaiah 38:10 שערי שאול and a synonym in Psalm 116:3 מצרי שאול (Στένον Ἀΐδαο) "straits of Hades" and also in Revelations 1:18 κλεις αδου (Κληῗδες Ἀΐδαο) "Keys of Hades".
Herodotus 5.108
The Phoenicians were sailing around the headland which is called the keys of Cyprus Φοίνικες περιέπλεον τὴν ἄκρην αἳ καλεῦνται Κληῖδες τῆς Κύπρου
κλεῖς; of promontories, straits, etc., Κληῗδες or “Κληΐδες (LSJ)
The Phoenicians were sailing around the headland which is called the keys of Cyprus Φοίνικες περιέπλεον τὴν ἄκρην αἳ καλεῦνται Κληῖδες τῆς Κύπρου
κλεῖς; of promontories, straits, etc., Κληῗδες or “Κληΐδες (LSJ)