Is the 'mask of Agamemnon' really his?

No. The gold masks Schliemann found in the shaft graves at Mycenae date to roughly the sixteenth century BCE, some three hundred years before any plausible date for the Trojan War.

Does the Odyssey say where Agamemnon was killed?

In his own house, after a landing on his own coast. Later tragedy moved the setting to Argos; the atlas records both.

All episodes

The murder of Agamemnon

Odyssey 4.512–537Odyssey

The Odyssey's counter-example: the homecoming that goes wrong. Agamemnon reaches his own country and is killed at dinner, and the story shadows Odysseus' return from Book 1 onward.

In the poem

Proteus tells Menelaus what happened: a storm at Malea, a landing on the wrong coast, a watchman posted by Aegisthus, and a banquet at which Agamemnon and his men are cut down 'like oxen at the manger'.

The poem keeps returning to it. Agamemnon tells the story again himself in the underworld, and Athena uses it to warn Telemachus. It is the alternative ending the Odyssey spends twenty-four books avoiding.

Why it matters for the atlas

It ties the atlas's most secure site to one of its least verifiable events — exactly the distinction the rubric exists to keep visible.

Competing theories

Mycenae
Proposed by: The poem itself; the site excavated by Schliemann · Antiquity
Plausible
The Odyssey has Agamemnon driven past Malea and murdered on his return. The place is accepted, the event is not evidenced, and Schliemann's 'mask of Agamemnon' is some three centuries too early for it.
Mycenae
- ArchaeologyHeinrich Schliemann, Mycenae (1878)
- Primary textPausanias, Description of Greece 2.16
Argos, in the tragic tradition
Proposed by: Aeschylus, Agamemnon (458 BCE) · Antiquity
Speculative
Aeschylus sets the murder at Argos rather than Mycenae — a reminder that the 'where' of a famous story can move between genres without anyone noticing.
- Primary textAeschylus, Agamemnon (458 BCE)

What is disputed

Where the murder was set — Mycenae in Homer, Argos in Aeschylus — and whether the story reflects any historical dynastic violence at the end of the Bronze Age.

Questions

Is the 'mask of Agamemnon' really his?: No. The gold masks Schliemann found in the shaft graves at Mycenae date to roughly the sixteenth century BCE, some three hundred years before any plausible date for the Trojan War.
Does the Odyssey say where Agamemnon was killed?: In his own house, after a landing on his own coast. Later tragedy moved the setting to Argos; the atlas records both.

Sources

Primary textHomer, Odyssey (trans. A. T. Murray, Loeb, 1919)
ArchaeologyHeinrich Schliemann, Mycenae (1878)
Primary textAeschylus, Agamemnon (458 BCE)
Primary textPausanias, Description of Greece 2.16