In historical times, the most devastating volcanic eruptions belonged to long-dormant, mostly andesitic to dacitic volcanoes. There is growing evidence that volcanoes can be reactivated even after several 10’s ka. This long repose time and the violent activation of such volcanoes is a major risk for the human population, since the quiet situation could reduce the awareness. Thus, one of the major tasks for modern volcanology is to improve our understanding of how and over what timescales seemingly dormant volcanoes are reactivated. This requires new, integrated methodologies linking geochronological, petrological, geochemical, geophysical, volcano-tectonic, geodetic, experimental and numerical modelling studies. We therefore invite contributions from different fields of geosciences that help to better understand the nature and duration of magma storage, magma transport and magma recharge in the plumbing of such volcanoes. We seek for contributions that focus particularly on 1) methodologies that can be used to study long-dormant volcanoes; 2) the characterization of the temporal evolution of these volcanoes with special emphasis on the duration of repose times between individual eruptions; 3) integrated mineral-scale studies combining petrologic and geochemical studies with diffusion modelling to constrain pre-eruptive magmatic processes and the timing and duration of reactivation; 4) the determination of the architecture of the magmatic system; 5) the detection of melt-bearing bodies in various crust levels; 6) detection and interpretation of surface deformation patterns; 7) experimental results of magma storage conditions during various evolutionary stages, i.e. during the quiescence period and before the reactivation; 8) numerical modelling of the thermomechanical changes in the magma storage and 9) detailed case studies for such events. The primary goal of the session is to promote discussion on this class of volcanoes, outline research strategies and emphasize their role in the volcanic hazard assessment.