Top panel: Star formation History of αPer over the past 40 Myr. The SFR is peaked around 8 Myr ago. The peak is associated with recent star formation in Sco-Cen S+24. However, the dominant peak corresponds to the formation of the ∼ 1000 M_⊙ cluster Theia 38, at a distance of ∼ 500 pc from the Solar System. Middle and bottom panel: SN rate and average time between SNe in αPer over the past 40 Myr for different values of t_delay. The SN rate continuously grows (the time between SNe shortens) as the stellar mass of αPer builds up, with a sharp increase in SN activity in the last few Myr, associated with the peak in the SFR, 8 Myr ago. The steepness of the increase slightly depends on the choice of t_delay, with a more gradual increase for t_delay=0 and a steeper increase for 0<t_delay<8 Myr. The SFH, SN Rate and average time between SNe of the clusters spatially associated with the LB are shown in purple, where we assume a fiducial value of t_delay=3 Myr. Also shown as shaded regions are the age of the LB as well as the average time between SNe found by Z+22 (orange) and this work (blue).