Two articles, one published in the journal “Nature” and one published in the “Astrophysical Journal Letters”, describe different aspects of a research that led to the discovery of the oldest known supermassive black hole. According to an estimate it formed about 690 million years after the Big Bang and it’s difficult to explain how it reached 800 million times the Sun’s mass. Labeled as Ulas J134208.10+092838.61 or more simply as J1342+0928, it may have formed during the so-called reionization period.