Alarming trends in global wildfire activity, and the associated risks to biospheric health, emphasise the importance of accurate baseline trends in pyroecology – exploring critical relationships between climate, vegetation, and fire through time. These trends have so far examined the role of anthropogenic activity in influencing wildfire behaviour, and how we may mitigate this hazard under progressive climate change. Evidence of wildfire in the past is found across a vast array of depositional environments - including peat, coal, consolidated and unconsolidated sediments (e.g., lacustrine), ice, speleothem, etc. – and in many forms, as both solid (e.g., charcoal) and gaseous (e.g., PAHs, soot, BPCAs) fractions of pyrogenic carbon. Applying wildfire-replicative experimentation, advanced spectroscopic techniques, and machine learning, recent developments in wildfire reconstruction have considered the true role of fire thermochemistry in driving the creation, alteration, and preservation of this evidence. This innovative research has challenged the historic identification of fire activity solely through qualitative means. Instead, new methods offer quantitative measures of past wildfire intensity, severity, fuel composition, and area burned that are consistent with modern principles in fire science. Supported by multi-proxy reconstructions of climate, hydrology, vegetation, and early anthropogenic behaviour, the study of past wildfire activity has entered a new phase of exploration. This session explores cutting-edge developments in wildfire reconstruction across a variety of methods, timescales, and environments. We seek to bring together voices from modern wildfire ecology, fire engineering, geochemistry, and palaeoecology to discuss how we may better integrate and inform our research going forward. We invite contributions that i) introduce novel techniques in past wildfire reconstruction, ii) evaluate and develop upon existing reconstruction methods, including but not limited to FT-IR, Raman spectroscopy, charcoal reflectance, charcoal concentration and morphometry, PAHs, BPCAs, charred phytoliths etc., or iii) explore and evaluate fire reconstruction in novel case studies (no specific environment, method or age remit). We strongly encourage contributions that integrate observations of modern wildfire or wildfire-replicative experimentation with new or existing methods in reconstruction, or where the implications for palaeoecology are expressly considered.