kaushalya sumitra kaikeyi and other wives relation seems like harmonious two were named at the time of putrakameshthi yagya vavata and parivitti at least to a great extent, dasharath ancestor sagar father had around 13 wives but the chief queen was pregnant and other wives tried to poison but he was saved by vashishth and names sagar means with poison as he was born with a poison mark on his body
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