A spider in a dream often points to patience and careful construction -- the web is a classic image for something you're weaving slowly, whether a plan, a relationship, or a creative project. If the web feels sticky or trapping instead, the dream may be naming a situation where your own effort has become a snare. Notice whether you're the spider caught in it, or the one who spun it.
Saturn seldom applies to any Planet, by reason whereof he signifies great Princes and Monarchs. - William Lilly (1602.-1681.)