Ultima II: The Revenge of the Enchantress/1990 A.D.

Lord British castle

 * Anytime, anywhere, a guard says: Pay your taxes!
 * In 1990 AD, in Castle British, the merchant orders: Give the King a tribute!

Offering gold to Lord British is the only way to raise and/or restore Health Points.

The hotel clerk in New San Antonio

 * In 1423 BC, in Le Jester, the chaste nubile nymph asks: Visit the Hotel California!
 * In 2112 AD, in Pirate's Harbor, the village idiot suggests: Offer the hotel clerk gold!
 * In 2112 AD, on Pluto, in Town Makler, the seaworthy pirate says: See the clerk in New San Antonio
 * In 1990 AD, in New San Antonio, a clerk states: Welcome to the Hotel California!

Offering gold to the clerk is the only way to raise the attributes.

Sentri's Quickblade

 * In 1990 AD, in New San Antonio, Santre the Swashbuckler warns: Beware, I've a quick blade!

The above line is the only clue about it, but you can offer 500 gold coins to Sentri/Santre and purchase the Quickblade.

It is the strongest weapon in the game, but its price is very very high regardless of charisma and intelligence. After all, any weapon can harm Minax.