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Zubi nagusia egin baino lehen, ibaia pasatzeko ibia Abadetxea eta Baltegieta 24 artean zegoen. Baliteke el castillo-n egotea ibia zaintzeko tokia, eta hortik izena.
Dena dela, kokapena eta izena (euskarazko arrastorik ez dago) kontutan harturik, ez dauka Erdi Aroko eraikina izateko itxura handirik. Aukera gehiago daude 1794 eta 1876 urte bitartean egondako bost gerretan, igarobidea kontrolatzeko edo aduana modura eraikia izatea.
1794 baino lehenagoko aipamena agertuko balitz, orduan Erdi Aroko jatorriak pisu handiagoa izango luke.
