Note: to those saying Hiruzen, the only hype he had is his great diversity in ninjutsu, which he is demonstrating. The only other hype is beating the sannin easily in his prime.
The hype that he's the strongest hokage was proven by a member on the base to be false since the area of the scan that said he was the strongest did not have text there in the original Japanese version.
I believe the databooks had them too.
Believe in the Hype!
Iruka, Ch.94
「三代目は 特に歴代の中でも最強�� �� � �言われポロフェッサーと呼ばれた�� �� �� ��だったんだぞ!」
"The sandaime, in particular, was a genius nicknamed the 'Professor,' and was called the strongest of all the Hokage".
the Sandaime was the strongest.
Databook 1, Page 117
"プロフェッサー"と崇められる歴�� �最 強の火影
The "Professor" revered as the strongest Hokage in history.
Databook 1, Page 119
"歴代最強""天才"など,三代目火影�� �� �形 容する言葉はに満ちている.
"History's Strongest", "Genius", etc., there are many words that describe the Sandaime Hokage.
DB2 Pg 84
Konohamaru paragraph:
歴代最強の火影と謳われた、三代目�� �� � �血を継ぐ木ノ葉丸。“木ノ葉崩し�� �� �� ��より敬愛する祖父を失い、その�� �� �は 悲しみに覆われる。だが必ずや里を�� �� � �る大樹に成長するであろう。果て�� �� �� ��標の祖父を目指して・ ・・!!
Konohamaru, descended from Sandaime, who was praised as history’s strongest Hokage.