Those who became a doshin in the early Edo period were specially called "fudai" (hereditary vassal), and even if they lost their official titles, they were still entitled to receive salary and could leave this to their descendants.
このように江戸時代初期から同心となった者は、特に「譜代」と呼ばれ、無役となっても俸禄を受けることができ、子孫にこれを受け継がせることができた。