Linn an Iarainn

Iron Age (c 800 BC – AD 400)

A preoccupation with brochs, and other forms of monumental domestic architecture, arguably persists in all narratives for the Atlantic Scottish Iron Age. Antiquarians and early 20th century researchers, attracted by the monumentality of these sites, investigated numerous brochs across the Outer Hebrides and in doing so established a strong baseline for future researchers (Armit 1992). Sites from the Outer Hebrides became central to debates in the late 90s around the classification and wider interpretation of monumental Atlantic Iron Age architecture, specifically brochs and their related forms (Parker Pearson et al 1996, Armit 1997a, Gilmour and Cook 1998, Parker Pearson et al 1999b), as well as discussions on the use of artificial islets for monumental structures (Harding and Dixon 2000, Harding and Gilmour 2000, Harding 2002, Rennell 2010, Lenfert 2012).

However, despite the ongoing narrative focus elsewhere, comparatively few brochs across the Outer Hebrides have been excavated in modern times. Dùn Mhùlan (Dun Vulan) in South Uist (Parker Pearson and Sharples 1999), and the two broch-type sites on the Bhaltos peninsula in Lewis, Dùn Bharabhat (Harding and Dixon 2000) and Loch na Bheirigh (Loch na Berie) (Harding and Gilmour 2000), are the only modern excavations of these site types.

Although brochs and broch-type sites have attracted substantial researcher attention there remain some pressing knowledge gaps. Fundamental questions on the chronology of Iron Age domestic sites across the Outer Hebrides, for example, remain unanswered. It is remarkable, given the attention these structures have received historically, that we still lack radiocarbon dates associated with the initial construction and earliest occupation of these iconic buildings within an Outer Hebridean context (although see Armit 1990, Harding 2002, Gilmour 2005). The problems with radiocarbon dating and calibration for this period are well known (Armit, 1991, Hamilton et al 2015). Nevertheless, it is clear that a targeted programme of dating would contribute substantially to our understanding of the Hebridean Iron Age as well as enabling more nuanced exploration of the relationship between Hebridean Iron Age societies and their contemporaries across the Highlands and the Northern Isles.

Wheelhouses, their construction and occupation are by comparison better understood. More than 15 Iron Age wheelhouse sites have been excavated across the Outer Hebrides. The vast majority are located across the Southern Isles – a reflection of key research projects across Coileagan an Udail (the Udal peninsula) in the 1970s (Crawford 1977), across the Bhaltos Peninsula in Lewis (Armit 2006), and across South Uist and Barra as part of the SEARCH project (Parker Pearson and Zvelebil 2014, Sharples 2012). Other wheelhouse excavations were instigated by infrastructure developments across Uist associated with Ministry of Defence activity within the islands (Fairhurst 1971, Young and Richardson 1962, Campbell 1992, Brown forthcoming).

Wheelhouses across the Outer Hebrides tend to be semi-subterranean machair sites, and their frequent exposure through coastal and wind erosion processes, lends visibility and an urgency to their investigation. Erosion has prompted the modern excavation of several wheelhouse sites across the archipelago including at least two individual buildings at Baile Sear, North Uist (Barber 2003, Dawson forthcoming), Cnip in Lewis (Armit 2006), and Rubha Hornais (Hornish Point) in South Uist (Barber 2003). It is likely that wheelhouses and other Iron Age occupation debris, such as the substantial midden sites evidenced at places like Baile Sear, will continue to be revealed in erosion and development contexts. How researchers and managers of the historic environment deal with this vulnerable but sizeable resource into the future remains unclear.

Material at Iron Age sites tends to demonstrate high levels of preservation and consequently there are substantial and well-preserved assemblages of Iron Age material to draw on from across this region. Although historically there has been mixed reporting and publication of Iron Age artefact assemblages (Sharples 2016, 634), and a few still unpublished sites (but see Dawson, Sharples and Brown forthcoming) alongside archival and museum resources there is huge scope for the collation, synthesis and analysis of the full suite of Iron Age material from the Outer Hebrides to contribute towards an ever more nuanced picture of Iron Age lifestyles and communities. The quality of faunal data from these excavations has led to a detailed understanding of Iron Age diet and subsistence strategies (Campbell 2000, Craig et al 2000, Mulville et al 2003, Craig et al 2005, Mulville et al 2009, Cramp et al 2015).

Decorated pottery is notably abundant on Iron Age sites across the Outer Hebrides and includes incised, applied, and impressed designs, simple cordons and finger-channelled decoration. Existing research on Iron Age pottery has focused largely on chronological development, the suggestion being that elaborate decoration declines into the later Iron Age (Lane 1990, Johnson 2005). In addition to the dating potential of Iron Age pottery, there is scope for further exploring the production and use of ceramics, including clay sourcing, firing methods and kiln construction, as well as the social, economic and ritual significance of Iron Age pottery (Campbell 2000). Comparatively neglected topics, however, include metal working and other craft industries and remains associated with these practices.

As with other areas, Iron Age funerary evidence is poorly understood across the Outer Hebrides. Current evidence, based on a small number of examples, suggests that formal burials for this period are defined largely by their diversity in style and practice. Although human remains are frequently found within domestic Iron Age contexts (see Armit and Shapland 2015) formal burials appear to be distinct from Iron Age settlement locales. Perhaps unsurprisingly then, current understanding for Iron Age funerary practices has resulted largely from opportunistic discoveries via developer-funded investigations or erosion finds rather than dedicated research projects (Cook 2018).

Souterrains are another Iron Age site type that are poorly integrated into wider narratives for this period and region. In the Outer Hebrides very few souterrains have been formally investigated and, similar to other areas, our understanding of their date, function and meaning is limited and up for debate. Like Iron Age funerary sites, souterrains tend to be investigated opportunistically (Moore 2008, Watt 2019, AOC 2025). A better grasp of the wider suite of Iron Age site types and material has the potential to truly move Iron Age debates beyond the brochs.

You can download the datasheet for more information on the Iron Age sites and c14 dates from the Outer Hebrides.

Outer Hebrides Iron Age Research Questions