As conferring Ippon was socially and financially of a great meaning, the conferment during ones' lifetime was determined very carefully while the conferment after ones' deaths took place relatively frequently; the first Ippon in the Heian period was conferred to the Imperial Prince Kazurawara in 831.
一品叙位は社会的にも財政的にも大きな意味を有するために死後の叙位は比較的多かったものの、生存者への叙位は極めて慎重に行われ、平安時代最初の叙位は天長8年（831年）の葛原親王であった。