Why isn't Israel Isjemin's Yahrzeit Exact?

We do not know the exact date of death of Israel Isjemin. According to Jewish tradition, if the exact date of death is not known, the yahrzeit of a person can be observed on any day, as long as it is that same day every year. Since that is the case, we observe the yahrzeit of Israel Isjemin on 11 Iyyar. If you know the exact date of death of Israel Isjemin, contact us via the contact page. Be sure to include the url: https://eachofushasaname.org/person/2320/Israel_Isjemin.html