LUXOR, Egypt (Dispatches) -- A major transformation in the way the dead were buried inside an ancient Egyptian tomb appears to have taken place during the Persian period, when funerary practices at Theban tomb TT 209 shifted from relatively separate burials to a denser and more spatially adaptive arrangement of bodies.
The finding comes from a new study published in Frontiers in Environmental Archaeology, in which researchers from Spain examined Chamber 3 of TT 209 in the Theban Necropolis, across the Nile from modern Luxor. The chamber was used and reused from the Twenty-fifth Dynasty through the Ptolemaic period, before being abandoned.
The researchers identified 16 mummified human individuals, a mummified dog and a disturbed deposit containing the remains of at least four additional individuals. Rather than interpreting the accumulation as evidence of disorder or the abandonment of funerary customs, the team argues that successive burials demonstrate a form of “funerary memory,” in which later occupants adapted their placement to bodies and objects already present.
The most significant change emerged toward the end of the Twenty-fifth Dynasty and during the Persian period, broadly corresponding to the late seventh through fifth centuries BCE. Earlier burials were generally more spatially separated, with individuals placed in coffins and accompanied by funerary nets, amulets and other objects. 
Some of the associated material was costly, including contents preserved in numerous Phoenician amphorae, suggesting that at least some of the earliest occupants held relatively high social status.
During the later phases, however, available space appears to have become increasingly important. Bodies were placed in spaces left by earlier burials, producing a much denser arrangement. In some cases, the position of the limbs also changed. Arms that had commonly been extended in earlier burials were sometimes folded inward, indicating variation in mortuary treatment.

The researchers also identified a striking development during the Persian period: a shift from predominantly individual deposits toward vertical arrangements in which bodies were placed above one another. Superposition occurred in approximately two-thirds of the chamber’s burial deposits.
This spatial transformation is particularly important because it challenges the assumption that reused Egyptian tombs necessarily became chaotic over time. According to the researchers, the placement of later individuals appears to have been constrained by, and responsive to, earlier burials. The chamber therefore functioned as an evolving funerary space rather than simply a repository for additional bodies.
The subsequent Ptolemaic period brought further changes. In the southeastern part of the chamber, four mummies and a dog were arranged in vertical superposition. These individuals had been carefully mummified but were not placed in coffins and were associated with upright jars, pointing to a ritual practice not identified in the earlier phases.
The presence of the mummified dog is particularly notable. It was placed directly above the lower limbs of a man and a woman. The researchers suggest that the animal may have had a personal association with the deceased, while also acknowledging a possible symbolic interpretation: the dog could have served as a psychopomp, an animal intermediary accompanying the dead on their journey to the afterlife.
Later burials also included individuals with both arms folded across the chest in what Egyptologists describe as the Osirian position. Together, these changes demonstrate that the tomb continued to be ritually meaningful despite repeated reuse.
Flooding, fires and subsequent human re-entry disturbed some deposits, making precise reconstruction difficult. Nevertheless, the study argues that what once appeared to be disordered remains can instead reveal changing strategies of burial, spatial adaptation and ritual practice across centuries of Egyptian history.