‘Half the Population of Viking Age Sigtuna Were Immigrants’. On a Saturday morning in August 2018, a scientific report made newspaper headlines all over Sweden. A team of archaeologists and geneticists at Stockholm University had found proof, it said; proof in the form of ancient DNA that half the population of the Viking Age town of Sigtuna were immigrants (see e.g. Spross 2018; see also Källén et  al. 2019: Figure 2). In interviews, the Lead Investigator described Sigtuna as the Shanghai or London of Viking Age Scandinavia and said he was excited to have been able to identify sec-ond-generation immigrants among the sampled individuals (see e.g. Spross 2018). Like a nova, the Sigtuna feature shone bright in Swedish media for twenty-four hours before it collapsed. From that moment on, no one wanted to talk about the Sigtuna immigrants.