However, the annexation of Silesia possibly took place around 985, because during this year the major Piast strongholds in Wrocław, Opole and Głogów were already being built.
Namun aneksasi Silesia mungkin terjadi pada sekitar tahun 985, karena selama tahun ini benteng-benteng utama Wangsa Piast di Wrocław, Opole dan Głogów telah dibangun.