Phases of the age of making the keris

1. Ancient
(Budho) in 125 M - M 1125
kingdom include: Purwacarita, Medang Siwanda, Medang Kamulan, Tulis, Gilingwesi, Mamenang, roller Wiraradya, Kahuripan and Kediri.

2. Ancient Madyo
(Ancient Middle) in 1126 M - 1250 M.
Kingdom includes: Jenggala, Kediri, Pajajaran and Cirebon.

3. Old Central
(Old Middle) in 1251 M - 1459 M
Kingdom include: Jenggala, Kediri, Tuban, Madura, and Blambangan Majapahit.

4. Tengahan
(Middle) in 1460 M - 1613 M
Kingdom include : Demak, Pajang, Madiun, and Mataram

5. Nom
(Young) in 1614 M. Until now
Kingdom include: Kartasura, HB, PB and Surakarta.

We have a clear stages of the age of the Kingdom have direct contact with the phase time of the keris, so at each time of the kingdom, there is some master craftsman who works to create a keris.